The Science Behind Dogs' Incredible Sense Of Smell

[@scwewywabbit]

This is the first time I've seen Derek is completely quiet almost throughout the entire video and not having to ask many questions or prompt the speaker and explain it to the viewers because Oh My God! The way Matt explains this is almost like listening to a cinematic story teller taking you though some of the most mind blowing scenarios and you are actually visualizing in your head the vivid details he's explaining! He's like the OG CSI!

[@techsoul5590]

Yeah, he's a salesman for evil, he has to be good at his job.

[@sawyer3818]

@@techsoul5590 most people have to be good at their jobs, regardless of whether you think its for evil or goof

[@willk113]

Guy was really not that smart or good at speaking i dont get why everyones jerking it to him

[@techsoul5590]

@@sawyer3818 Incompetence is far more common than you give credit for. Sales/PR isn't the place for incompetence or morals though.

[@riparianlife97701]

A TV producer would be mad at him for wasting 6 seasons of crime science on a KZbin video.

[@n.s.wickramanayaka7056]

Matt Staymates' presentation skills are truly amaizing. explanations are crystal clear and not a single ummm in the entire video.

[@georg240p]

5:20 ummm

[@yourmommashouse]

@@georg240p not matt

[@MattRose30000]

19:33

[@showalk]

There's one at 10:20 :D

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@olimpiacookiethrower]

This guy was amazing, he explains things so damn well and there's no need for a question

[@veramae4098]

They exhale out of the small "crescents" on the sides of their nose. A different route from inhaling. Horses do the same thing.

[@godspeed2145]

There are smart people, & then there's this guy

[@GregMoress]

He's a good boy! Such a good boy!!!!

[@JaiPritchett]

You would need to say that the people he interviews are very good at explaining things to him and he is just really good at relaying that information

[@expioreris]

A question: do we really need that turbulent outflow that goes out through the same holes but slightly tilted backwards?

[@johnmcneal9477]

Very informative video. I worked for 23 years as a police officer and for 10 of those years I was a K9 handler. Both of the dogs I had over the years where trained for narcotics detection, tracking, article searches and handler protection. A typical article search would be for something a person had handled or discarded or hidden in the last few hours such as a weapon or stolen property. One of our officers once lost his keys while wrestling with a suspect trying to handcuff him. My dog was able to find the keys in the thick grass in just minutes. I was constantly amazed at the dogs natural ability to search and track with those noses. I have tons of great stories and memories and so many success with the dogs it still blows my mind when I think back to some of these. And really the best part of being K9 was the bond we built together. That is a story in itself.

[@Southerngrl]

That’s a story I’d like to watch a video on KZbin about. The bond between the handler and k-9. Thanks for protecting and serving. ❤

[@johncspine2787]

I started my dog in basic scent detection, he’s a German Shepherd, I didn’t continue with it as I realized I was doing it more for me than him, but it’s fascinating. Ppl don’t realize just how much data a dog processes when they sample the air. Dogs live in a very vibrant world we can’t imagine..

[@mattd8411]

Thats awesome I bet you seen all sorts of things. Did you find anything in particular that confused the dog? Mark Rober is a nasa engineer does a awesome video on search dogs.

[@mateus_bandeira]

This guy should have their own KZbin channel. I could listen to him talking about stuff for hours.

[@proph7543]

@@gonelucid The guy behind the camera is the usual host and the owner. I don't know much about the guy who does much of the presenting here, but I assume that they're just a researcher in some government lab.

[@Lk95rulez]

@@gonelucid *isn't

[@kjohn5224]

their own? like a group of people?

[@VK-sz4it]

This guy gives vibe of a Gerald Batler's character from "Law abiding citizen". First time in my life I see someone who could be that guy in real life.

[@WLF0X]

But he actually has a real job

[@murphynuglene3714]

You can tell this guy absolutely loves what he does. It's so awesome.

[@gutika113]

Yeah, but the application of his work is straight for use by law enforcement 👎 🥾

[@coolcatawesomesauce]

@@gutika113 so its bad to solve crimes?

[@StratixGaming]

@@gutika113 Literally used to stop terrorism and half the video is talking about detecting bombs however you see this as a negative? Kinda sus bro

[@KevinOrIsIt]

He said laser light at 7:37, 8:01, and 8:27. laser is an acronym for light amplification by stimulated emission of radiation.

[@gm_construct_13_betaexplor38]

@@KevinOrIsItlaser is also a noun, what is your point

[@llKaiserx0ll]

That guy needs his own youtube channel.

[@hexisplus9104]

The lazer doc guy? Probably knows enough to.

[@CYBERCATXO]

He is Mark Rober tho

[@Bill22886]

@@CYBERCATXO hahahahahaha Almost

[@azgarogly]

He has much more important stuff to do than entertain some million people sitting on their toilets

[@SciTechGeeked]

@@azgarogly This is not just entertaining, it's enlightening too!

[@RisingOne2See]

3% dog info: 97% particle flow visualization. Disappointed this was not focused on dogs (because of the title) BUT… still a VERY interesting video.

[@derekjackson8832]

Yeah its a forensics video for sure

[@Selustarius]

Very clickbaity title

[@ryanmcclary7034]

Stfu.. go watch cartoons

[@djwaco2623]

Dogs? 🙃

[@waltercambron2231]

Agree 💯. It's a good video, but it's completely off topic. Disappointed

[@seansampler6808]

I don’t know how you and your team have been pumping out videos this quickly but thank you!

[@SimulationWithDaniel]

They upload more in december since it gives the most ad revenue

[@dcamron46]

@@SimulationWithDaniel why is that?

[@noahverreth5280]

@@dcamron46 It is the end of the year, and quarter so if companies see that they have some yearly budget left, they can use this money for advertising.

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@unknowntimelord9557]

These recent videos were all related to NIST. They got much material out of that visit

[@takenuser2k]

Matt was 100% right about most people not sitting down and read a scientific journal. Your channel is proof enough for most (I feel like). I know I have never been like "Hmm. How do I measure the tiniest forces in the universe?"... but I still watched your entire video. And like he said, the problem isn't the science itself, it the communication. Being able to actually SEE the effects/proof of what is being talked about is a much easier way for media to convey their information.

[@user-hx1cz8lm2s]

These 20 minutes felt like 5 though lol

[@kiuk_kiks]

You underestimate the cognitive deficiencies of the average person.

[@coRliX4k]

to me thats what makes science so amazing... you hear in class but they dont really show you how its all around you

[@jm9371]

Clear, concise and fascinating. This content blew me away.

[@aampudia8]

but it blew you how far away?? like, with how many particles?? can you show us with your schlieren setup?? hahaha

[@matthewp4046]

Night and day vs that helicopter drop video

[@cagneybillingsley2165]

i can't help but think the guy is a liberal wimp because of his prey eyes, his sleeves being short like that and him not wearing anything under his sweater

Absolutely agree. Its mesmerising how well done this science is. I know this is generalizing but i kinda feel like this is how science should function.

[@nedludd7622]

This guy speaks better than 90% + of KZbin site hosts, including the one here. Example, he doesn't throw in the word "like" uselessly as this host, and most others, do.

[@kanishkaveediyabandara3028]

The way this guy explains stuff is incredible. Halfway through the video I was like "huh, Derek barely talked in this video"... why would he?! The guy does a phenomenal job of communicating. And props to Derek for letting him shine through.

[@fishnsyd]

These NIST videos have been fascinating. There’s nothing better than hearing straight from the experts who also happen to be engaging and interesting people!

[@SourabhDas95]

My capstone project in university involved using laser light sheets in front of fume hoods to check flow and test their effectiveness and make sure fumes weren't escaping. That used 3 lasers, red, green, and blue, at different distances from the face of the hood to visualize multiple 2D cross-sections and better capture a pseudo-3D visualization. This video brings back memories of that. Really cool to see the laser light sheet technique being used in all sorts of forensic and disease transmission research applications.

[@mycosys]

why do they not scan the sheet back and forth for a 3d area?

[@NATESOR]

@@mycosys it'd also look rad af

[@NATESOR]

@@mycosys it'd also look rad af

[@toolbgtools]

using different colors is great idea. also, we can further extend it by using multiple wavelengths of light. it's actually like 3d sheering

[@toolbgtools]

@@mycosys we can't because turbulence is chaos and moving back and forth will take some amount of time

[@SirWuffleton]

There’s an art to distilling a technical subject into just the right amount of detail for a layman with extra detail sprinkled in at important parts for those with a deeper understanding. It’s a balancing act between providing enough detail without overwhelming those not familiar with the topic. Matt absolutely nails this and it’s always cool to see professionals in other technical fields using this strategy as it’s something I use frequently in IT!

[@kdcbattlecreek]

@SirWuffleton can you say something about the relationship to IT? I'm interested.

[@MiddleMalcolm]

With the revolver firing imaging, it's interesting to see the release from not only the muzzle, but a most significant sound from the gap at the cylinder. This really busts that old TV and movie cliché of the revolver with a suppressor or "silencer". All, absolutely fascinating stuff. Deep subjects like this are always particularly fun, because you can easily make direct connections to real world function. Matt is a great presenter, and if he isn't already, should be instructing at some point.

[@seifer447]

Take this with a grain of salt, but I've heard that revolvers can be silenced if they are built with one in mind. My understanding is that you can diminish the distance between the frame and cylinder to basically nothing. I could not tell you where I heard it and I haven't verified it. Just a thing I heard before.

[@kyrillos6677]

The laser sheet method definitely makes me think of the moment a sun light beam enters my room and I first see small dust particles floating in that beam.

[@connorvanhelsing4768]

Yess! I've also blown vape clouds into the same beam to see air currents!

[@tetrabromobisphenol]

It's exactly the same effect, just with an incoherent light source. If you're not trying to measure 3D velocity but rather just visualize particle patterns, it doesn't matter what type of light you use.

[@ComradeMario]

That's Tyndall effect

[@glitteringstar6059]

yea I hate that cuz then you realize how much dust is in your room

[@last_avenger]

@@glitteringstar6059 same here

[@electrojag1]

I love now knowing the intricacies of the dog nose. it’s always been known (to me) that dogs have amazing smell, but to see why gives me a whole new appreciation 🐕.

[@aeremthirteen2771]

there was no why

[@chucknorris3752]

They have one reason why, I suppose. But they didn’t talk about the actual olfaction itself.

[@forget2bhuman993]

' (to me) '? like that isn't common knowledge?

[@forget2bhuman993]

@@chucknorris3752 because this is about airflow and such. not neuro science

[@aeremthirteen2771]

@@forget2bhuman993 because you said so, right? Or..? Director?

[@dotacow22]

Its amazing how much elegant designs there are in nature, from the Japanese train engineers who modeled train fronts after bird noses to reduce sonic booms and noise, to this, its just gives you hours of stuff to think about.

[@shellderp]

You see a lot of "AI generated" solutions to various problems these days. Nature is just that learning and adaptation process at a much larger scale

[@redline589]

@@shellderp Of course, every house is constructed by someone, but the one who constructed all things is God.

[@l.rod.8558]

@@redline589 bro go away

[@kkuhn]

The prime mover is a flawed ideology

[@匿名-x5m]

@@redline589 You don't belong here

[@alm0925]

I adore the incredible passion Matt has for the work done at the NIST lab and his explanation of the various experiments is just top notch. Incredible video despite the fact that it veered away from the dog smell topic pretty quickly. Excellent content as always!

[@newbie4789]

That laser screen is such a good way to make cool live wallpapers

[@nemui_kinoko]

okay jackson

[@Anurag.Ganguly]

@@nemui_kinoko okay boomer

[@AhmadAmr98]

Dude keep those thoughts to your SELF!!

[@kirkydaturkey]

13:38 yes! Dude thought the same.

[@shredder8525]

Till you go blind XD, there's a reason they had laser googles on

[@kylehenline3245]

I'm amazed at the enthusiasm of all the scientists at NIST you have captured. This whole run has been so informative about careers in STEM, absolutely fantastic stuff. You and other educational creators are the best of internet.

[@abbymeehan7739]

This guy is such a natural presenter!

[@MartKencuda]

Which is odd because the video makes it look like he's the only one that works there lol

[@abbymeehan7739]

@@MartKencuda My dude has just been dying to show someone his lab!

[@throwaway3756]

@@MartKencuda Don't worry., he wrote "a code" to replace them all.

[@volthunter3]

yeah he almost seems trained, like his job is to convince people of his science more than actually doin science, i wonder why anyone like that would be employed by that company and not a larger group that would fund a talking head, idk weird huh lol lmao xd hahahaha he's very good

[@timbatimba]

@@volthunter3 people that are passionate about what they do tend to behave like this.

[@TheLanceGamer]

Who else tried to sniff 5 times in 1 second?

[@lawrinceikwuka1787]

I did

[@ralphhonore2722]

😂😂😂

[@chukwuebukaumunnakwe9478]

You don catch me 😂

[@LiwaySaGu]

😂😂😂

[@mjr819]

Guilty

[@LevJ0y]

I love to see how passionate Matt is about this subject

[@defeatSpace]

Now think about how much tax money he's wasting through various inefficiencies and technical overtime.

[@rajkishore95]

@@defeatSpace lol shut up, sitting on your fat butt complaining about scientists who do good work

[@legathar8558]

@@defeatSpace I love making claims without evidence

[@xXBRgamesXx]

@@defeatSpace what do you mean by this?

[@mycosys]

Devotees of the cult of authoritarianism are always ful of zealotry

[@anuranjo4809]

Some years back I took a tour of this very lab at NIST. I saw Matt Staymates and his research division lead Greg Gillan. They were working with 3D printed dog nose for explosive detection back then and the way Matt explained this to us was cool. Fascinating.

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@chimkinNuggz]

They're trying to take jobs away from good boys!

[@basilbiscuit2735]

Interesting! How did you get that opportunity? Is it something they do often, or was it more of a special access type of thing?

[@tomatomaki]

​@@GriffinZambia My brother, the OP's story is far more interesting than your half-assed name.

[@markfrye9178]

Two take-aways. Science is fascinating. Matt Stayma is an incredible teacher!

[@ericswearingenmusic9967]

That dude absolutely loves what he does.. and takes huge pride in his work. Not to mention. He is an awesome presenter/teacher.. hope to see him more on the channel

[@NBD300]

Notice how quiet Derek Muller was? Rich Press is amazing at his field.

[@juicedelemon]

@@Caseyneistat3010shut up

[@hamoodhabibi]

That's not Rich Press, it is Matthew Staymates

[@scientia_potentia_est]

The work done at NIST and ISO is so underrated. I feel like there should be like a national holiday to celebrate the life-saving work these guys do.

[@Shrooblord]

Now that is a really cool idea. International Standards Day x')

[@nicklame2647]

Towards surveilance society we go, soon your farts will be analyzed in real time, *pling* you will get message that your health insurance has been terminated.

[@sirBrouwer]

@@Shrooblord do know that ISO stands for International Organization for Standardization because La France. but that must be the most expensive party there is when every item must be a ISO item.

[@vigilantcosmicpenguin8721]

Looks like ISO was established on February 23, 1947. That's as good a day as any for a celebration.

[@TRProz]

I don't know how this popped up on my feed, but this was AMAZING to watch. This scientist knows his stuff and explains it in an easily digestible and entertaining way, so I kept watching. Flow visualization. Quantitative Analysis....Fascinating!!!!

[@victorferro6862]

That guy explains everything really well!

[@teflonmac5082]

He is more articulate than some leaders of the world today.

[@zero4961]

@@teflonmac5082 look at his eyes. They move around like he is scanning his mental database. its insane!

[@spicychad55]

Looks like Nose what he's talkin about!

[@niknik0815]

Dude, this guy was explaining so well and in such an entertaining way, I am glad you cut and added so little and kept so much original footage. Nice edit!

[@skjetnis]

You keep finding these incredible people who just loves what they do so much, and in return we get this amazing content. Keep it up

[@jaylc]

This Matt guy was one of the best presenters in a Veritasium video I've seen. Bravo.

[@LostMekka]

i started to grow carolina reaper last year and i am very familiar with these dust movements by now, because when you dry chili and grind it to a powder, you always have these particles that stay in the air. and you dont want to breathe in this stuff, believe me xD i didnt have a fancy setup like this, but i used a bright light to illuminate the larger particles, so i could figure out how to move in a way to not accidentally pull these particles towards me ^^

[@lsoldeMaduschen]

wouldn't something like a fan help with this issue? preferable outside/towards the outside so that those particles will get pushed away? or the opposite something like a vaccum cleaner to suck in those particles?

[@Djuntas]

@@lsoldeMaduschen Or make them wet as you cut. Water kills dust movement anyway.

[@lordgarion514]

I'm a chef, and a few weeks ago the other chef threw a handful of blackened seasoning on a piece of fish, literally seconds after one of the exhaust fan belts came off quietly. I walked right into an invisible cloud of it. In my eyes and up my nose. 🤬

[@Sagittarius-A-Star]

Are you actually eating them or is it just for the thrill?

[@LostMekka]

@@lsoldeMaduschen that was my first guess as well, but fans create too much turbulence and then the particles disperse evenly, making it hard to breathe :D i settled on gently waving the air away from me after opening the mixer unit, while having an open window nearby. of course, a professional ventilation system that just sucks in the air immediately would be best, but that is not available for me ^^

[@Failzz8]

Very fascinating, but also incredibly scary to think about how this could be used to track pretty much anything anyone is doing.

[@Shrooblord]

Myyyaahhh but the costs involved and manpower / hours needed to develop AI to _replace_ the manpower in getting all of that organised is (still) pretty unfeasible. Then there's admin, 'some incompetency', conflicts of interest, funding, etc. etc. Not to even mention any counter-movements or all that work getting cut short for whatever reason before it gets a chance to properly be launched Whenever you think about something scary and all-encompassing like that, also think about how "clunky" most things are we do on a general basis... and then try and marry the two concepts x)

[@jasondashney]

@@Shrooblord A smartphone was very very clunky in 2000 but by 2012 they were ubiquitous and essential for modern life. A dozen years.

[@Shrooblord]

@@jasondashney that's pretty true! Then let's keep paying attention and using the tools at our disposal to advocate for what we believe in, and fight what we don't...!

[@13lckr]

With the laser sheet, I wonder if using several different laser sheets of different wavelengths stacked closely together, you could analyze the color of it to model the flow of the air over the table in 3 dimensions.

[@DKFX1]

Had the exact same thought. Oddly I am very familiar with this specific visual phenomenon because it occurs naturally in my home on a sunny day. If you have a dark room filled with smoke and there are rays of sunlight making it through your black curtains then this effect will be very clearly observable.

[@RikKoedoot]

Super cool idea, though wouldn't like a blue sheet in front of an orange sheet make the orange sheet not visible for the camera?

[@kseriousr]

@@DKFX1 Ever since I saw how much dust particulates are hovering in my seemingly clean room, I was never quite the same. Even in our most hygiene, we're filthy 😄.

[@starstuff11]

@@DKFX1 yep scattering

[@Nielsquake0]

@@RikKoedoot Rapidly pule them or alternate the wavelengths and you could easily make probably a 1 meter long one with spacing of like 10cm or less per laser sheet at reasonable refreshrates depending on pulse lengts and camera sensitivity. Would be cool to have a 3D real time particle map at high resolution to track air current but I gues just simulating it would be more efficient

[@TheSchwiz]

Believe it or not, this is the perfect example of how early humans made stories to explain things, and once you have an actual understanding of how things work, something that is incomprehensible becomes known. And why when people just throw a bunch of related actions or data and claim they can make a conclusion, but really can’t because they don’t understand how anything works.

[@harrybeasley6608]

Shout out to this guy. What a natural behind the camera. What a natural educator. Nice vid Derek. Loved it, thanks

[@Hopeinformer]

This is by far my favorite stuff on this channel. Thank you for breaking it down so thoroughly and sharing it.

[@d.bcooper2271]

“The FBI gathers evidence. Once evidence is gathered, it is turned over to the Department of Justice. The Department of Justice then decides whether it has enough evidence to present to a federal grand jury. In the case of the 1998 United States Embassies being bombed, bin Laden has been formally indicted and charged by a grand jury. He has not been formally indicted and charged in connection with 9/11 because the FBI has no hard evidence connecting bin Laden to 9/11.”

[@ghgracia85]

That dust spread is why cross contamination is so challenging for celiacs

[@kjyost]

@Aluzky I would suspect the answer is wheat flour 🤦‍♀

[@kjyost]

@Aluzky I can infer the reason is that wheat flour, a fine dust, could get on everything as they show here with talcum powder, thus getting gluten into celiacs intestines. Celiacs have a genuine diagnosed medical condition that even the tiniest amount of gluten can cause huge inflammation. I suppose you could not see that connection. Alas.

[@bcoda]

dang imagine them using this tech to protect people with conditions/allergies/diseases instead of immediately trying to hunt down more brown people

[@mikes9275]

Don't know how I ended up on this video at 1am, But so glad i did. I learnt something truly fascinating that I otherwise don't think I would have ever thought to learn. Top content mate, easy to understand while being informative as well as entertaining.

[@justayoutuber1906]

Wow - Matt is one of those rare individuals that is really smart and great communicator. I would love to see more videos with him explaining things. NIST appears to have some great people working there!

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@danieldey]

Finally I understood how the Schlieren setup works. Thank you Derek!

[@gemo9561]

Wow the passion in this guy is next level. He REALLY loves what he does for a living.

[@olidhossen9785]

Last few months I've seen your channel and gradually I realize your videos are very very exceptional and kind of highly research based.🎉🎉 As an ordinary viewer I want to thank you and your whole team from the core of my heart.

[@Wormweed]

If all teachers were like Matt we would all be way better educated, or learning the same in less time. Listening to him was amazing.

[@jacobpalmer9247]

This guy has one of the coolest jobs I've ever seen.

[@choco1atech1p45]

One of the coolest guys I've ever seen. Super informative and an incredible teacher.

[@valmikg1]

Impressed by this guys presentation skills, ability to condense material to lay-terms, and be passionate. Kudos

[@nimaghoroubi9324]

I cannot explain how good this channel is, the amount of information and versatility of subjects is so goddamn optimal that I just have a braingasm when im eating or cleaning and watching this channel. I am happy that you exist.

[@nobody_expects_me]

You with Kurzgesagt are in my opinion the overall best scientific educationnal channels ever, and I feel so priviliged to be able to watch those videos for free.

[@0x45Swims]

Kurzgesgat is billionaire propaganda

[@thejericho]

kurzgesagt is not very objective, they say what their sponsors want them to say, and it so happens that most of their videos are sponsored by Gates. some ppl on yt made videos about this

[@lisandroCT]

So you like propaganda.

[@nobody_expects_me]

@@thejericho I mean yeah, the one the man made viruses was pretty shady, I certainly did not like that one. But there are some videos that are not deserving the hate they get, and even the most controversial before this one were quite well argumented and were were overall well put together.

[@witheredstrike]

​@lisandroCT oh shut tf up, its not propaganda... their videos are so well made and also well argumented. This is justvpureley exagerated

[@satoshinomade]

This video was absolutely incredible, I got kinda sad when it ended. You can really feel Matt's enthusiasm and how much he loves doing that stuff. Amazing content, Derek

[@NoWorldOrd3r]

I have the attention span of a chihuahua and was focused the whole video. Awesome work!!

[@tim40gabby25]

Um.. what's the attention span of these little dogs, then?

[@wrobelda]

@@tim40gabby25 definitely not long enough to work in this lab!

[@350c10]

That says so much about the way that guy communicates. It had my attention throughout

[@Prajjwal4242]

Wow what a comment

[@kurtnowak8895]

Good boy!

[@Ytryanymore]

I like how simple yet complicated the set up is like anyone can build it but know where the exact points to get the best image definitely a challenge.

[@akarp111]

because we live in a world of vibrations! :-)

[@lukasausen]

linus tech tips made a schieleren imaging thingy to mesure graphics cards airflow wich is preatty cool tbh.

[@Ytryanymore]

@@lukasausen I just seen that crazy

[@muxpux]

Coming back a year later to say, I bought a cheap laser machine off Amazon (one used to do light shows) and a relatively cheap DX controller for it. I then bought a fog machine. The laser machine has all sorts of different patterns and settings, but I found one that is simply a sheet of green laser. Combined with the fog machine, it makes for a super interesting toy. From vortex cannons, to waving your hand, to “vape style tricks” like tornados… I can play with it for hours. I also bought a laser level that does a 360° sheet, and it works ok, but is most fun outside, in the fog at night. I love the weather and as such have become obsessed with fluid flow, and its visualization is something that really fascinates me. It’s even better when someone else sees it and has that “oh wow!” Moment. I really need to do the schleiren thing. But seems complicated.

[@DarthCrustyYT]

The change in title/thumb was good

[@zer0nix]

One of the best explanations of schlieren imaging! I want more of this guy!

[@gamma2816]

This was the BEST video by FAR! Absolutely amazing job, it's been years since I didn't skip through a video or watch at x2 speed on KZbin in general, but I was so captivated the whole time through that I couldn't stop watching in absolute awe. So here is a comment for the algorithm, we gotta spread this.

[@manojdesai3942]

Thanks!

[@veritasium]

Thank you!

[@Sad_King_Billy]

I've seen this imaging technique explained several times and it still looks like a magic spell. How does someone look at light and think to chop it with a razer blade? Incredible. Loved the video!

[@JP-lz3vk]

What he's doing is polarizing the light, which is why you can "see" the changes in density next to the mirror

[@d.e.7467]

Yeah, the razor blade is a remarkable addition. It's a very low tech solution.

[@lordgarion514]

Sometimes you just gotta cutta beam. 😄

[@tetrabromobisphenol]

It's an interferometer. The razor blade edge causes diffraction. It's not used to block light, it's used to measure phase differences caused by small changes in the index of refraction in the sensing region.

[@tetrabromobisphenol]

@@JP-lz3vk Hate to say it but no, this is not due to polarization effects. Schlieren images are effectively phase contrast.

[@Neurofilia]

This is one of the most beautiful Veritasium videos in all sense: a lot of science in it, beautiful visualizations, good research, good explanation... just amazing !

[@KTStrategic]

Fascinating video! But a point of clarity, (medic here, for reference) his comment about Fentanyl isn't accurate; it takes a significant amount of inhalation exposure for fentanyl to be absorbed intranasally - although it looks like a lot in the video, it's still highly unlikely to be an exposure risk.

[@mycosys]

espescially to the soryt of person who would take that job, someone likely to have a very high tolerance from repeated exposure prior to taking the job (ie a veteran user)

[@TehMuNjA]

yes, that line was pure BS and yet just taken at face value without question, a common talking point in the bogus war on drugs police propaganda

[@rdizzy1]

You can absorb it into mouth tissues as well as into your lungs for direct exposure though. Most people breathe at least partially through their mouths, not solely through their nose.

[@Chibs]

@@rdizzy1 And that somehow makes up for the giant dose neccesary to ovedose in the first place? The idea that one could overdose through exposure like this is simply false, no two ways about it. Sad to see Veratasium perpetuate such copaganda.

[@TehMuNjA]

@@rdizzy1 the surface area of the lungs is extremely large and made specifically for transfer into the blood stream, i'm no expert but i would think any absorption through mouth tissues would be negligible in comparison

[@richkroberts]

Derek’s work is so well done, even when something doesn’t seem that interesting (going by the title), I always end up learning a lot, even if I think I know the topic. Thanks for posting such high quality content Derek!

[@mattstyles2498]

I like how this guy is definitely passionate about his work and is great at explaining it.

[@hridoy8021]

This was one of the best videos you came with Derek! Love that guy, it feels like he's so passionate about what he is doing. And his explanations were so smooth! Love it 💜

[@gersonperez3781]

Finally, the "Elevator Fart Detector" invented.

[@collectorguy3919]

...experiments at the holiday party

[@MegaSahil009]

Hahaha

[@someyoutuber99]

Wow this guy really knows his stuff, and can communicate it so well. This technology, tools and techniques are incredible.

[@TechDiveAVCLUB]

Truly good video! Impressive choice to let the obviously talented presentation skills of your guest stand front and center. I don't think other channels would have made such a good decision, in fear that the viewers are expecting "derek." Great editing and presentation. Thank you Derek for all the different styles you do!

[@jesuschrist3872]

This is a great comeback after last video! This one really has the quality that Veritasium is known for 👌

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@aries_9130]

That was absolutely fascinating. I would love to see more videos with him, the way he presented this stuff was super professional and clear.

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@sobaro-R]

10:30 bro had this insane aura 💀

[@colinmartin9797]

This was so cool and the lab presenter did a phenomenally cool job with one tiny caveat - the whole "minor fentanyl exposure is dangerous" thing is a myth. As an experienced EMT with a biochemistry degree, this is simply not true and a weird urban legend perpetuated by police departments. Stilll, this video was awesome. All these examples are so much cooler than the stuff I learned in physics classes.

[@The_Fat_Turtle]

I've always found it strange that all these people die with fentanyl in their system and everyone insists it was tainted cocaine with no other option. I don't know what that could mean, but it's something I observed and thought was weird.

[@ToriKo_]

+

[@MrDantesBJJ]

I believe he was more referencing that if the person working in the production of fentanyl does not have a mask on, it would be lethal due to the high inhalation exposure throughout period of time. Especially in the video where the person was handling large amounts of particulate matter, not what an average addict would have at their disposal.

[@lordgarion514]

Umm, 2 milligrams of pure fentanyl is considered more or less lethal. According to Google 2 milligrams = 7.055 × 10⁻⁵ ounce That is a small amount. I doubt you have too much experience dealing with addicts handling pure fentanyl.

[@lordgarion514]

Umm, 2 milligrams of pure fentanyl is considered more or less lethal. According to Google 2 milligrams = 7.055 × 10⁻⁵ ounce That is a small amount. I doubt you have too much experience dealing with addicts handling pure fentanyl. To visualize that, it's 4 grains of table salt. And that kills people. I don't think getting 2 grains worth in or on you, would do you any favors. How much did that degree cost? 😄

[@vickieurantian1554]

That's why dogs can get a sense of when you're supposed to be home from work based on how much of your scent is left in the house.

[@imveryangryitsnotbutter]

Wouldn't it be easier to just notice where the sun is in the sky?

[@LividAF]

@@imveryangryitsnotbutter Not if they are stuck inside of the house. It’s also probably easier for them to use their strong sense of smell. I would imagine it’s similar to how we would try to find the source of a smell in our homes. Like if someone was cooking, we could tell by smelling it through the air.

[@SnailMan63]

@@imveryangryitsnotbutternot to mention the sun changes position in the sky at times throughout the year

[@Fisher_007]

My theory has always been that they have a very good inner clock. My dog gets dinner at 6pm and he starts nagging me between 5:30 and 6, irrelevant of the sun since for example sunset is at 4pm now.

[@K40005]

Most animals have a very good body clock (my cat will pester me for food at almost the exact same time every day with about 10 minutes difference being the furthest from that time) (which is 4:30)

[@polarpaw224]

I’m happy to see so many others also experienced awe over the experience of listening to Matt. I was wowed by how enjoyable he was to listen to. It drew my attention, specifically.

[@Morphinwithyou]

Amazing! We can see how enjoying while teaching his findings. Thank you for the awesome work Matt Staymates. You should create a youtube channel and work on this area for science not only for the Government pigs.

[@LunaMapping_KR]

This guy is a great talker and teacher, I’ve learned so much on this video and was entertained the entire time, glad to see the technology used behind the scenes get a spotlight and be appreciated by the public

[@bartolomeothesatyr]

Hey Derek, how about some Veritasium about the measurable harms perpetrated by prohibitionist regimes? imagine if all the resources and mental efforts that go into prosecuting people for self-medicating with illicit drugs were instead directed toward improving public health and early childhood education.

[@Scott-.]

Matt is so engaging, such a great speaker! Please get him to teach and show us more!

[@euphorik1979]

This was one on my favorites. Very cool tech, passionate and clear explanations. Well done!

[@RjWolf3000]

I remember observing my dog doing this. We called it motor mouthing because they also open and flutter their mouth when doing it. If you do it yourself you will smell things you wouldn’t otherwise notice.

[@jesusdanielhernandez6304]

Yeah I actually started mimicking this method to try and sniff out feint smells. It really does work, although you definitely look weird while doing it 😅

[@lordgarion514]

But if you do it in public, people are going to look at you funny. They might even back away.

[@killerowire]

this comment section is gold

[@PeterGenovese]

I just tried doing this and smelled my neighbor's asshole. Pretty cool!

[@RjWolf3000]

@@PeterGenovese you are most likely just smelling your own breath.

[@PierceArner]

Biomimetic Design is one of my all-time favourite things, because you're taking systems that evolution has refined at various scales and then implementing them into technology to vastly improve its effectiveness in ways that we'd never be able to do with just normal iterative testing or conceptualization.

[@GriffinZambia]

*Ok_Dont_Read_My_Namess* ....

[@anteshell]

Evolution does not strife for perfectness. It strifes for adequateness. When some feature is good enough to overcome the selection pressure, there is no more pressure to evolve and the further development will be stagnated. In school terms, more often than not this results in minimum grades required to pass the class, but far from actually learning the subject and becoming good at it. While we find very good and novel solutions to some problems from nature, it's not as much that the nature does things good as it is that nature goes around solving these problems very differently than humans are used to think, and due to sheer amount of different solutions in nature there are bound to be some good ones. This is the case of infinite monkeys with typewriters. When we find solutions from nature, it's more like combing through the text those monkeys write until we find something good.

[@captainunknown2839]

@@GriffinZambia stfu who asked

[@crypticTV]

8:13 theatrical fog 9:50 skin cells 11:30 12:30 14:30 explosives tracing 15:22 drone use 16:00 18:00 18:30 3 letter agency

[@BeyondTheIslands]

The AB testing on this video goes wild. I have seen it on homepage under three completely different names and thumbnails. One is something like "Catching criminals by seeing air" with a gun on tn, other is very neutral "They see movement of air in this lab" with same gun, and now it's "The Science Behind Dogs' Incredible Sense Of Smell" with thermal of a dog and a smell trail somewhere outside.

[@westzed23]

I found this episode amazing. I have not worked in forensics in 30 years, and it is so great to see what new methods are being developed and used.

[@zombieowen]

Imagine using this for factories and workplace safety. Hazards caused by house fires or burn pits. The math and physics of airflow is fascinating and making it visual really hits home. Do dogs have the best sense of smell in animal world? What animal has the best hearing, the best vision?

[@ThaBeatConductor]

It's always really hard to answer a lot of questions like that about nature because everything is so specialized. For instance, by our visual standards, dragonflies have terrible visual resolution, but they have a 90%+ success rate for hunting, and have also remained relatively unchanged for hundreds of millions of years. Another example is the mantis shrimp. They have the widest visual spectrum of any animal so far and are the only animal that we know of that can see polarized light.

[@ngcastronerd4791]

@@ThaBeatConductor Firearms as well. Military types using firearms regularly are exposed to incredibly noxious fumes as was demonstrated. Designing guns that redirect the gases away from the shooter will greatly improve this.

[@usmh]

Eagles and falcons have often been said to have the best (meaning sharpest) vision, being able to spot a rabbit in grass from a couple of kilometers away or something. Bears have a notoriously good sense of smell, having a nose size advantage over dogs. I don't know about the best sense of hearing, but big whales have been said to be able to communicate with other from different sides of the world.

[@ThaBeatConductor]

@@usmh The one about whales is less to do with their hearing and more to do with how sound propagates through water, especially at certain temperatures and pressures. That and whale calls are super mega loud.

[@NEO_MusicProductions]

this technology is kind of scary for me. I am a DJ, and let´s not get into if I use substances or not. Let´s focus on just me being on stage, people snorting drugs left and right, even if I didn´t touch any drugs, these test would show me as contaminated. The question is, how do we differentiate between just a bystander, and a trafficker, or a manufacturer. If they just start screening everyone, i bet your ass, every single person who enters a club/bar is going to be contaminated. I don´t like this idea very much... for bombs, yeah go for it, but for substances, they really need to set some standards to avoid false positives...

[@bassett_green]

Matt is a phenomenal presenter! You can tell how much he loves the subject matter

[@JoeyLocs-jz1ys]

Great video and presentation! I didn't want the video to end! I could listen to him talk all day!

[@chopwhoopz]

that was incredible!!! i cant stop thinking how cool it would be to have a set of glasses that can do that and then just go about a regular day.

[@Tinyvalkyrie410]

My father was a NIST physicist for most of his career, so I grew up running around the halls and being invited into labs. It’s so cool to see all this stuff, I’ve been sending each one to him, and he’s been loving it.

[@_EDCstuff]

I worked at a video store about 20 years ago, and the guys who worked there would play "the smell game". They'd take newly returned dvds and squeeze the air out of the case to smell what the person's house smelled like. I thought it was kinda weird

[@davidmacphee3549]

Smells can unlock memories and feelings in a weird way too.

[@bobbylee7801]

You should have cut them some cheese 😂

[@_EDCstuff]

@@bobbylee7801 Dude, buy some liquid ass on amazon, and take it to walmart's candle section. I've actually taken women on dates to do that, it's hilarious. We usually left in tears from laughing

[@davidmacphee3549]

With risk to bore you, I worked in the Security industry responding to false Alarms in the night. After thousands of service calls, I would have the coded envelope ready with the keys and go in. As I stood in the doorway, I would close my eyes and breath. Surprisingly, I could visualize where to find the cause of the disturbing "Emergency"

[@davidmacphee3549]

@@bobbylee7801 We saw 'Pet Rocks' in 1975 and lots of silly fads making a killing over the years. Is it time to Market packaged Farts? Oh. It has already been patented. Oh well .. Here's mine. Brappp!

[@itzmistz]

During the laser sheet part, I really liked seeing patterns disappear and reappear. It's like a 2D observer would see this 3D thing appear in and out of existence. It helped me slightly imagine if a 4D object would come into our 3D world

[@sophierobinson2738]

Look for a little book called “Flatland”.

[@jagadishk4513]

Like a tesseract

[@deusexaethera]

This dude is a one man forensics lab. Amazing.

[@kemsatofficial]

Cartels watching this: “Man, now we gotta buy fume hoods & those closed off boxes they use when dealing with anthrax or small pox.” Edit: ok all I’m saying is this is just a weapons race, which can go on forever, and considering it’s drugs, it will go on forever. Point is, if your methods get better, so will theirs. Simple.

[@yaad2226]

CAN YO MAMA CAN DO BETTER ?

[@pierrotA]

They surely already do it, along others methods. But the dog can detect the small traces that you leave from your shoes or hand. If you take a box on a drug lab, then walk inside the truck to hide it, you will leave the smell. You can see it in a scene of breaking bad. They shoot a small bag of drug next to a truck to make the dog mark it. The traces are enought.

[@cauadoca260]

i personally am going to buy a mask so i don't get addicted to all the fentanyl i am making

[@mihailmilev9909]

lmao

[@mihailmilev9909]

@@pierrotA wow

[@zagstrug9053]

Fascinating topic and amazing visualization, props to all in front and behind the camera!

[@copc4ke341]

Okay I'm going to be real, these kind of videos push me to get up from my bed and continue my studies because they show how much we can achieve as humans. Thank you to Veritasium as always!

[@samx1555]

I think this was my favourite Veritasium video of all time, the clarity in the explanations WOW

[@bonehead2426]

I am scared that these methods will be used in trials and convictions could be made due to this type of evidence being considered infallible by jurors. Also being able to tell exact chemicals based on a tiny sample seems like a massive privacy issue.

[@85krink]

My first thoughts were “how will the government us this as a way around warrants”.

[@Gunny-rt3lb]

I think that's the point he made of 'whats the difference between the person who shoots the gun and someone who is in the room 3 minutes later' Knowing those differences is what makes it reliable evidence

[@alexscriabin]

@@Gunny-rt3lb no, most forensic sciences don't work the way prosecutors and police officers say they do (and how procedurals tell jurors to think they work). False positives for a dozen different respected but unreliable tests are very high.

[@StreakyBaconMan]

What worries me the most is the guy did not seem unbiased at all, I didn't hear him once talk about clearing innocent people or ruling out suspects - he focused almost entirely on catching people with residue from drugs, guns and bombs. Also the amount of focus he puts on fentanyl specifically just screams law enforcement bias - for some reason police are currently obsessed with fentanyl and convinced they'll die or OD if they are even in the same room as it, something he seems more than happy to confirm for them by literally saying you'd die if you were in the same room as fentanyl without a mask despite that being a load of absolute nonsense. According to The American College of Medical Toxicology and the American Academy of Clinical Toxicology the risk of clinically significant exposure to law enforcement/emergency responders is significantly low - but do you think the police believe them? No. And they'll just point to someone like this guy and say "see I knew it was super dangerous for me".

[@Donkeyiser]

In a way, I'm more scared by the implications if this technology actually does work like he's claiming.. I wonder if his company has already started talking with the Saudi government about the potential for cataloguing every who has ever been to a particular gay nightclub.. I guess it's a matter of time

[@rfm0]

11:13 This guy is brilliant and engaging. You hear his passion for his work so clearly.

[@t1mmy13]

This is only "one dimensional" detection, could you add dimensions by adding more lasers in different wavelengths in paralel laser to get some more 3d data?

[@berrylars4887]

You know that’s old school mate

[@kwcnasa]

Yeah, would be interesting to see.

[@DFPercush]

You could sweep that plane across the third axis by spinning the emitter and reflecting it off a parabolic mirror. Record a video of it and each frame is like a slice from an MRI.

[@CSNCSNCSN]

2D actually, and moving the plane is usually what is done.