The World in UV

[@EpicLPer]

6:00 - I always wondered how scientists flirt with each other... I guess that's a question answered now. _"Your skin looks so good in the visible spectrum of the light"_

[@brokenacoustic]

dont forget taking off your shirt in front of the cute girl...for science, of course lol

[@JB52520]

Or, "He likes the smell of you."

[@LLLadySSS]

Lmfaooooooooooo

[@paradox...]

The #ship sails once again!

[@oliverwilson11]

p sure she has a bf

[@Master_Therion]

Will enough UV exposure cause heavy damage to the skin? Or will it only cause... light damage?

[@thenight1732]

Yes

[@benoitm2810]

Badum tss

[@Twas-RightHere]

I see what you did there.

[@HACKINGMADEFUN]

Pun and all

[@JoeARedHawk275]

National Trolliosis Foundation No, but you can stop a shut-in

[@IAmSneak]

if you want to get rid of the fog just turn up your render distance

[@RazoneIsaqt]

And turn down the density and the emission of the cube

[@st4rf1sh36]

Turning off clouds also helps

[@ThetheuxAlbuquerque]

not every one has a nasa pc at home dude... some of us play at low

[@najwafitri9798]

XD

[@penninna]

And turn on ray tracing…

[@dbell95008]

After losing the lens from one eye after surgery (and none was implanted), I discovered how much more I could see into the near UV. A common fluorescent "black Light" tube is barely visible in daylight with normal vision. With my "lensless" eye (and a contact), I could easily see a lighted tube as a purple-white glow from tens of feet away in full outdoor daylight.

[@MacDaniboi]

This is why I desperately want eye surgery.

[@tietosanakirja]

Wow

[@blackmber]

Does that mean the lens was absorbing UV light before it was removed, protecting the retina from damage?

[@renziie2804]

wait does that mean you see the world in 2 different ways?

[@aryapatel7615]

@@renziie2804 cool man

[@physicsgirl]

"How do I put this..." at 6:05. Nice Derek, nice.

[@mukil_saravanan]

Lol

[@kevinhart4real]

:P

[@D4N50M3]

Dadbod

[@veritasium]

#unscripted

[@avetiszakharyan]

this is happening!!!!

[@samthachamp5035]

I wanna be as happy as he was when the soda started bubbling

[@jamessouza7065]

then do it? Be happy!

[@catgirlsleepy]

@@jamessouza7065 its not that easy...

[@stevethea5250]

@Orion D. Hunter timestamp

[@kyrlics6515]

@@catgirlsleepy yes it is

[@catgirlsleepy]

@@kyrlics6515 not it isn't Lemme ask, how old are you?

[@Caracazz2]

- Son, did you apply the sunscreen? - ...yes, mom! *turns on the UV camera*

[@tmBlackWings]

Hahahaha

[@yusha1059]

Nice

[@bigchungusdriplord2301]

Lol

[@WereWade]

Parenting level 100.

[@Longus07]

@@yusha1059 did I just get rickrolled by your about page.....

[@davinci69]

What I find particularly fascinating is that if we could see UV light we would most likely also see colours there. This would of course only be the case if we had multiple photoreceptors for different UV wavelengths but it is still quirky to think that colours are actually just illusions.

[@egg4444]

it really just depends on what you count as an illusion; the brain filters and creates a lotta stuff

[@davinci69]

What i mean is that colours are only some certain wavelengths. There isnt a colour for every wavelength. That means colour is not a physical property of light.

[@nmatavka]

There are people that can see UV (have an eye that can handle it). It's not THAT rare, about 1 in 10 I think... but that 1 in 10 can ONLY see it if they ALSO have a missing eye lens or a prosthetic eye lens. This means if someone like that looks at light through a prism, his "violet" will stretch out a bit longer than yours, but he'll need to wear sunglasses when he steps outside so as not to be blinded.

[@kreaturen]

I'm also curious how the brain would represent it, especially the so called color wheel. I mean, blue blends into red only because of brain magic. If we could see UV, surely some other color would blend into red instead of blue. Or, perhaps, instead of new colors, the color spectrum would simply get shifted (to account for the broader spectrum), i.e. UV would become blue, and current blue would become more greenish.

[@kreaturen]

@@GabrielsEpicLifeofGoals It is an illusion, because visible light doesn't actually have any "color" properties, anymore than gamma rays does. It's all a mind trick.

[@radicalxedward8047]

Sunscreen companies should do this as an ad. I would have been WAY more likely to use it as a kid if I could see that it actually does anything.

[@nikolaos6083]

^

[@rubyrules]

^^

[@nippelfritten2312]

^^^

[@TheGiantcube]

In the Netherlands I've seen an ad like you described of people on the beach and a UV camera

[@lasarousi]

Using it once and using your eyes is kind of enough to know it actually works.

[@FilliamPL]

*talking to a girl* "You're so beautiful... just not in the UV spectrum"

[@Brashnir]

and what if I've got a thing for freckles?

[@Ray-ei2ro]

"You're so beautiful..." Under UV light she looked evil as hell.

[@MaDrung]

I thought he was going to find remains of sperm :D

[@stevethea5250]

@@Brashnir damn his skin 8:14

[@confusedwhale]

@@Brashnir: They aren't freckles. They are Sunspots.

[@htme]

Great video and thanks for the shout out! I was wondering why our UV footage at Death Valley was so hazy in the distance, now I know why!

[@veritasium]

How To Make Everything yeah I originally thought the reason for the haziness was going to be lame and ruin all the shots but I was pleasantly surprised with the Raleigh scattering answer

[@scelestus6930]

Veritasium, Very good video! It was really fascinating to see in the ultraviolet spectrum, your faces and especially the sky. A tiny mistake? It's called Rayleigh scattering, if I'm not mistaken. Love from Norway.

[@henil0604]

@@veritasium Hello sir

[@baagiibaterdene5570]

Ooo option to

[@kospap92]

@@veritasium Great video! We need a "The world in Infrared" now to make it complete! It would be really interesting to explain why we see better through fog or why veins are clearly visible in near infrared.

[@Selfg12]

This actually shows me how well sunscreen actually works.

[@starlightx3052]

UV camera is a best way to do advertising of sunscreen )

[@pim3089]

nivea did it

[@redpoint6870]

Royan Mangeli in fact, clear skin has it's advantages. (There is a reason why we evolved to have it)

[@CateChapelle]

Then it might look a little racist

[@Keesha_Hardy]

Red Point Um, you evolved to have PALER skin, not clearer, only because living further away from the Equator means less Sun and UV ray exposure, and the need for melanin decreases. That's why racism is so stupid. If all the European and Asian people moved back to areas closer to the Equator, everyone on the planet would have the same skin tone after several centuries and vice versa.

[@redpoint6870]

Docbndgrl9113 you make it sound like there is a problem with it. We are clearly different, adapted to different things... Like cebras and horses, not better or worse just different

[@a2rhombus2]

I'd love to see a video like this for infrared as well

[@jaystarr6571]

1. Get a remote control and your cellphone 2. Turn on your cellphone's camera 3. Push a button on the remote and point it at the camera lens 4. Look at your phone's screen while doing step 3

[@PabloAM93]

Jay Starr seeing the pulse of an IR led in a remote is not even close to something like this video.

[@PabloAM93]

A to Rhombus You could do it yourself. Buy a old inexpensive digital camera that records video and search on how to remove the IR filter that sits in front of the imaging sensor.

[@a2rhombus2]

I don't just wanna see IR ya dork. I wanna see a video like this where he talks about cool sciency stuff.

[@NickyNiclas]

Lets spice it up with the whole spectrum mixed together, I honestly don't know what that would look like, it might be a terrible mess.

[@mathewgonz]

So can we promote cellphones to incorporate this? Everyone could use this at the beach to make sure they’re covered properly

[@dogon3]

I love how you made knowledge into a practical use.

[@cleavage2697]

I think there is commercially available filter to cameras. Maybe also to phone cameras. And definitely some "software" could fake it.

[@dogon3]

@no u trash UV is almost everywhere, during daylight hours. Most of the harmful rays degrade when they hit inanimate objects. Human bodies have a certain amount of natural protection, because the outer layer of skin is already no longer alive.

[@dogon3]

@no u trash Not likely. It depends on the intensity and dose.

[@alterego3734]

@Mathew Gonzalez Idiots have taken over your comment's comment section :(

[@totallynoteverything1.]

8:10 dude looks like he's covering himself in mud to not get detected in a covert mission in Nam

[@chrispersinger5422]

Black face? Lol

[@totallynoteverything1.]

@@chrispersinger5422 dude looks like he's covering himself in mud to not get detected in a covert mission in Nam

[@totallynoteverything1.]

@@chrispersinger5422 unoriginal joke, so I just made Vietnam joke because of how the dude is putting it on his face

[@chrispersinger5422]

@@totallynoteverything1. Yeah I was joking about the black face lol

[@chrispersinger5422]

@@totallynoteverything1. Ah yeah the totally original Vietnam joke lol

[@Karabetter]

SOOO *OZONE* is supposed to block UV... An interesting experiment would be: Set up an electric arc (which will normally create the "ozone smell") and see if there is a stream of ozone emanating in dark waves with your UV cam ???

[@takumi2023]

i don't know how effective that would be because of how scattered the molecules are from the arc. you have to collect it first in order to make it work.

[@ChadEichhorn]

Seems exactly like the kind of video I would expect from Smarter Every Day

[@missclarestube]

From what I have read ozone blocks uvc. Maybe someone can confirm that?

[@realw98]

Ozone blocks far UV spectrum with shorter wavelengths. What we see in this video is near-UV which is not blocked by atmosphere so we can... see it.

[@SzDavidHUN]

+missclarestube UV-C [...] is entirely screened out by a combination of dioxygen (< 200 nm) and ozone (> about 200 nm) by around 35 kilometres (115,000 ft) altitude. en[dot]wikipedia[dot]org/wiki/Ozone_layer#Ultraviolet_light

[@nebvbn4504]

So sunscreen is basically... Paint? In the UV spectrum.

[@alexgratzaTV]

yes.

[@jojo35996]

Black face*

[@AllTheArtsy]

No

[@dat_killaz1094]

A “protective” paint

[@kaaiplayspiano7200]

@@sriramn1809 so... it's magic.

[@hoangtran4736]

do not, under any circumstances, shine uv light in a bedroom.

[@goombacraft]

why? i wanna do this now

[@atulshukla7128]

@@goombacraft germs. Germs everywhere.

[@allensnea9335]

Did you watch one of the Gordon Ramsay videos about bad hotels He actually has a KZbin channel on that genre

[@pappu2490]

@@goombacraft bodily fluids are illuminated in uv/blacklight

[@ahumanbeingamnayplaceholde1746]

@@pappu2490 Lol

[@Musicswagg86]

Miss you PhysicsGirl, I hope you feel better soon

[@ErhanGaming]

In an alternate universe: 'The World in Visible Light" - "Why is visible light so clear compared to our normal hazy atmosphere?"

[@sygeno_yt]

It wouldn't be called visible light in an alternate universe where UV light is normal and visible

[@Nico-dt5hu]

@@sygeno_yt and our visible light will be their infrared

[@Khaerulbtg]

@@Nico-dt5hu how about their infrared?

[@Architector_4]

I know it's a joke, but to think of it, if humans were to see things in UV, everything would be wildly different. We wouldn't be using glass, and having transparent/translucent surfaces would probably be a bigger hurdle for the progress of science. Or maybe we'd die out as a species as we developed seeing these particular shades of color specifically because they helped survive the most lol

[@theincarnateofkurro]

@@Khaerulbtg *visible light*

[@_baller]

Fact...everyone looks sunburnt and aged in UV light

[@stevencorrea6946]

Love the stuff 47 looks 25.

[@AllTheArtsy]

Yeah, skin aging is caused by UV

[@networkpuppet]

So is sunburn

[@GpD79]

8:14 Not if you wear sunscreen. This kid's face is flawless. Or, if you're black 8:06.

[@awybabe]

GpD79 i was literally about to say the black part lml

[@electronicsNmore]

I have a buddy that got his 2 front teeth knocked out playing football years ago. I spotted his with a UV light by accident. Great video as usual!

[@DayDreamer1230-n1i]

lol

[@thanksfernuthin]

But did you notice that every shot of his teeth in Ultraviolet after that initial one looked fine? I'm confused.

[@xavierav6717]

thanksfernuthin yeah

[@Sk0lzky]

Welcome to the squad lol

[@ryoswolf]

@@thanksfernuthin They don't. Pay attention to his two frontmost teeth at 8:17 and you'll see that they have the same discolouration as before.

[@mel0dymak3r]

it's hard to wrap my mind around birds being able to see in ultraviolet as well as normal color vision...

[@MrMegaMetroid]

I mean technically uv light is no different at all, its not a different kind of light, just a different colour. We are to birds what dogs are to us, unable to see specific colours

[@shadowcween7890]

@@MrMegaMetroid it's the qualia problem

[@MrMegaMetroid]

@@shadowcween7890 not really. The qualia problem revolves around the idea that two people can have different ideas of the same colour, without ever having a meaningfull way of communicating this idea. This is not so the case here. We know uv light is just another colour we cant see. Its an entirely different, completely new colour on the same spectrum. Uv light is not an entirely new vision, as the other commenter has pointed out, nor is it a debate about human vs human perception, as you stated

[@renanmendes1299]

@@shadowcween7890 play amongus

[@renanmendes1299]

amongus

[@AllTheArtsy]

I really need there to be a consumer-level UV camera so I can add it to my skincare routine

[@smithjane9170]

Sunscreenr if you have an android

[@Luthiart]

...aaaand another neurosis is born.

[@DanielTaylorOCMD]

A normal high end DSLR can be modified to remove the UV and Infrared filter on the camera's sensor, then use an appropriate filter to only allow UV or infrared into the lens. The downside? I did this to a camera and really enjoyed the IR end of things but filters for UV are VERY expensive and hard to find. For one thing, just try typing UV filter into a search and you will get nothing but filters that prevent UV rather than allow it to pass while blocking visible and IR. It is for these reasons I have yet to take a single image in UV light.

[@luddity]

@@DanielTaylorOCMD Is there UV in computer screens?

[@mynamehasspacesinit8687]

Cyanotypes are only photosensitive to UV light, so all you need to do is stick some cyanotype paper in an analog camera that can do a long exposure for more than 3 hours.

[@crazylazybros2473]

buzzfeed: is putting on sunscreen blackface?

[@RudraJain]

You put a comment on lazarbeams vid? It was in his video

[@curlygurly2112]

Sunscreen is RACIST??

[@konfunable]

I demand to stop sunscreen because it is racist.

[@GpD79]

Now isn't this the epitome of cultural appropriation, white people appropriating the essence of an entire group of marginalized people: their blackness.

[@liamryan7239]

GpD79 What are you talking about?

[@souravzzz]

You two have really good chemistry.

[@Ragsc]

Really good physics.

[@joeshedler6496]

"You two have really good chemistry." LOL not bad for 2 physicists!

[@jelmar35]

They turned their chemistry into classical mechanics

[@Broadpaw_Fox]

At 1:33 - the 'haze' with a UV camera is a great demonstration of why the sky is blue. It's showing that the UV light refracts more than the lower frequencies, and since the blue/violet spectrum of visible light is the highest frequencies, they scatter more. A UV camera isn't picking up those lower frequencies, so it can't see anything through the 'haze'. :) **edited for spelling because autoderp**

[@Broadpaw_Fox]

@Elegance - well, the blue and violet are the highest frequency light we can perceive, though the violet is right at the edge. It will technically scatter more, but it's harder to perceive and overpowered by the blue. Think about sunset though- as it gets darker the sky goes much more towards purple, though it's a deep relatively dark shade. That's when it's most easily perceived, because you're getting more of it scattered in from the brighter part of the atmosphere and the more easily seen colors aren't as powerful because they scatter less, and are further away. Also, to be clear - I'm talking about the deepest, latest stage of sunset, in the twilight before full dark. That's when the violet is most visible. 😀

[@Broadpaw_Fox]

@Elegance - that one is a bit different. Red light is the other end of the spectrum, the lowest frequencies visible. Those are much better at staying coherent and "punching" through the atmosphere, and when the sun gets low in the sky, or when there's a lot of particulate in the air (like smoke from a fire) then the red frequencies are the most able to get through that obstruction. At the beginning of sunset there's a lot of the atmosphere between you and the sun, and that means there's a lot of various particles it has to go through, and that colors the light by scattering it around, and only the lowest frequencies (red for the visible light) gets through. You can watch it happen as the sun sinks lower - it starts out a bright gold, then fades to red until the sun is dim enough to look at directly with naked eyes (only that last minute or so) and it's a deep red. But that's only the atmosphere causing that color shift - the sun is still the same color all day, and always emitting the same amount of light energy. Even though it looks red sometimes, it's still basically white. It's just our dirty air that colors it at times. 😀

[@HotCupOfEarlGray]

They litteraly said that in the video

[@ratobiajin]

4:58 was unexpected, indeed.

[@rmontz738]

[In Stefon voice] This video has everything...

[@TheBlueSpot97]

Unexpected but appreciated

[@ghhhhhhhhhh]

I genuinely didn't expect a thirst trap in this video

[@WL69420]

😫🎉

[@advait_dhopeshwarkar]

Exactly the reason why most signals in road traffic/airplanes use red. Larger wavelength>>not scattered easily>>improving visibility over longer range.

[@MarkOfArgyll]

Add weirdly (or not) military use red lights because they are harder to detect due to the lack of scattering.

[@beverlyanne5699]

It is because our eye's do not have to climatize to the lens colour as it does in darkness with white lens. This is also why military uses the red lens, it is less detectable too.

[@renedekker9806]

The real reason is because the colour red is rare in nature, and unconsciously associated with danger.

[@j-em5762]

@@renedekker9806 dafuq you talking about lol as a biologist I know that red is everywhere in nature! From fruits, to crustaceans, to insect coloration, to animal fur, hell even blood. If you want a color that is rare in nature, try blue.

[@jasonchu4400]

bruh you trippin' red light scatters easily....because it has a larger wavelength and cannot last long in long distances as high frequency colors my ninja....

[@Slushee]

8:27 bc you have your render distace low 😂

[@petergeramin7195]

Lol

[@b3gabriel66]

fakin potato pc

[@Incognit0777]

*Visible light master race*

[@yinyang1217]

@@b3gabriel66 ikr

[@Nico-dt5hu]

i thought he was playing roblox not minecraft

[@markiobook8639]

I love how flowers fluoresce in UV.

[@ShayerSUtsho]

Please make "The World In IR"

[@mcmb8254]

Shayer S. Utsho what is IR?

[@ShayerSUtsho]

@@mcmb8254 Infra Red

[@mcmb8254]

Shayer S. Utsho thank you, btw that does sound really interesting

[@superknightlol]

army has been using ir flashlight and goggle since ww2, people without those special device cant see the ir flashlight but army can and it give them special advantage. its basically invicible flashlight or spotlight. ir can also be use to detect heat signature from tank usually in black and white, white being the hottest. ir is the most useful thing.

[@ShayerSUtsho]

@@superknightlol Thanks! I learned something there.

[@SuperVstech]

Wow!bluetooth!

[@veritasium]

How did I miss this?

[@hd_y]

Ba dum tss

[@reggie6339]

SuperVstech Brilliant

[@niezrozum]

Everything becoming better with bluetooth

[@WayneDavisDA_ILLESTalive14]

SuperVstech ... You just did that

[@94nolo]

1:14 your two front teeth aren't purple or darkened anymore?

[@cesarperezargota]

Wait what... You're right. I'm confused now :lll

[@civotamuaz5781]

It's simple. Just like in visible light you have different colors and different color filters you have the same thing in UV, that is different UV colors. On one UV filter they're purple, on the other they're not.

[@bartsshorts]

alans snackbar

[@cesarperezargota]

civota mu az But then shouldn't his two front teeth still stand out from the rest with the other colour filter? They don't, however, which is what confuses me.

[@civotamuaz5781]

Well obviously not since they don't :D

[@Arutemysu]

For a long time I always wondered why I was near blind during day, and especially during summer. Doctors thought my eyes were photophobic, so I used normal sunglasses without UV protection, but everything was still hazy, I thought it were the glasses from the sunglasses. Few years later I went to the doctor again and they did further tests, I was suppose to look at different lights in the colour spectrum, only to be able to see the UV lights as their true colour. Since then I always wear glasses during day that block majority of UV light so I can properly see during day. It's always weird being able to see colours most people can't. Where I am able to see a certain colour. Most people either see bright pink or dark blue, some even see just greyish black. I do have a massive advantage at night, where I see near clear without extra lights, other people always need extra lights to see normal. Also the sky for me is more UV coloured than blue.

[@Empika]

Woah

[@shi_mo_neta]

As much as I want to believe this, I'm kinda skeptical.

[@m4heshd]

This is some Reddit worthy stuff. You should write a post.

[@Arutemysu]

@@shi_mo_neta just because you yourself doesn't have it or see it doesn't mean it isn't possible. If everyone was the exact same the world would be rather boring.

[@itsoktoberight4431]

@@shi_mo_neta same thing happened to my father in law after he had his cataracts removed, it's like a little superpower 🤣

[@micahphilson]

Aw man, why didn't you film a person with albinism under the UV camera? Their skin would have looked so different! Maybe even someone with melanism!

[@XxPlayMakerxX131]

Micah Philson I was disappointed when He didn’t film a black person in UV they would look even darker

[@xenontesla122]

He does at 8:06.

[@rorymckenzie7110]

XxPlayMakerxX131 pretty sure you don't get people with melanism, just black people

[@Aeikon]

Rory, not sure if you are joking but just in case. A person with melanism would actually look unnaturally dark. It could be argued that some specific races and regions particularly Ethiopians have evolved with melanism, and having the trait has become a norm but even among them there are some people that go past the natural very dark brown skin tone to truly having black skin color.

[@kshitijjhalak1939]

I don't think complete melanism occurs in humans. If melanism occurred in humans then you would have people with extremely dark skin regardless of the skin colour of their parents. Also calling people from Africa melanistic doesn't make sense because melanistic animals like panthers can have fair/normal skinned cubs and you don't see two dark skinned people having a unusually fair skinned child unless it is albinism.

[@Videohead-eq5cy]

You're getting old, Derek. Now you're awesomer!!!!!! I admire and respect the heck out of you!

[@shobhitkaul8076]

Metal Pappu he is older in uv!

[@Videohead-eq5cy]

Shobhit Kaul he's got a white beard though

[@procatprocat9647]

8:00 How long until mobile phone cameras have a UV mode to check how well you've applied sunscreen! This could save a lot of skin cancer issues.

[@el-il2kc]

this is so smart

[@clb4947]

you'd need a filter on the lens and Idk how hard/expensive that would be to do for manufacturers

[@Chimera_Photography]

@@clb4947 actually, you don’t need to add a filter, you need to remove the existing UV filter from the sensor. It would be cheaper...

[@clb4947]

@@Chimera_Photography that's actually pretty cool, thanks for the info ^^

[@LaKoeps]

@@Chimera_Photography you could attach a slide to the internal UV filter so you can slide it away from the main lens if needed.

[@itsTomate]

The most amazing thing to have learned or to think about is that the sky is just a… haze. Like, it makes sense once you said it, but like… that’s just so strange to think about- it’s just the sky, the sky is blue, but the sky is a blue haze.

[@GraveUypo]

well, you already knew it if you ever saw a picture of low earth orbit. you just didn't connect the dots, apparently.

[@mishak38]

@@GraveUypo u got quite an ego.

[@phonomancer_thepossum6279]

The electromagnetic spectrum in my absolute favourite area of physics, I find it so fascinating that there are sooo many more colors in our universe that just the ones that we see every other day.

[@HarmenHoek]

This. Is. Quality.

[@manuellozano5567]

How would a rainbow look in the ultraviolet? Would there be an "ultraviolet bow" right next to violet?

[@cymaticCS]

Yup, there is always an ultraviolet bow next to the violet bow, but we just cannot see it!

[@TheParablade]

I want a double UVbow across the sky yeah yeaaaah

[@sethleverett8889]

There would theoretically be a inferred radiation rainbow too

[@JeramieCurtice]

UV light is a spectrum of the rainbow. Can light see other light? They are both just frequencies on the nano wavelength scale. Same spectrum, but when rainbow colors combine, we typically see it was white light.

[@bspringer]

Exactly, same with infrared next to red

[@asebaninja]

Disappointed you didn't talk about the camera itself :(

[@schitombite]

A Seba he showed the filter that filters out visible light and let uv through

[@aseliatheeternal202]

A Seba I am also really interested on the exact camera and filters used on this...

[@TheCls63]

its easy the camera is a simple 4k camera he just put a UV lense on it, you can do it on your own phone

[@aseliatheeternal202]

Usual digital and phone cameras comes with internal UV (and IR) blocking filters. Usually one have to remove the UV filters in order to make it to work. *the removal of UV blocking filters is way harder than one may think because in most of cases it is a coating on the camera lens and sensor itself. So the risk of breaking it is very high.

[@Eralen00]

I modified an old point-and-shoot camera into a UV/IR camera. There's a filter that blocks UV/IR light that lies between the lens and the sensor. Remove that and use either an UV or IR-pass filter or any dark lens filter (i used a dark red photography filter for IR)

[@lordfeish1927]

that moment when you realize that sunscreen companies are secretly making you wear blackface

[@JustinDrentlaw]

Lmao can't believe this is the only comment about this xD

[@ChronicNewb]

I came to the comments looking for this

[@avrgegmer1396]

That's kinda the point of how it blocks uv light. Just how when you get a tan or people who work in hot clinates have darker skin. It is the dark pigment that is essentially blocking the uv light. It is part of its nature. Like how white color repels sunlight but black absorbs it.

[@anduro7448]

Secretly racist

[@firstladychosen1371]

@@anduro7448 Openly triggered 😭🖕

[@LiftPizzas]

The stuff shown in this video would be like if space aliens showed "how humans see" and just combined all the wavelengths in our entire visible spectrum to one "brightness" value at each pixel. I would have liked to see it "interpreted" with different UV wavelengths represented as the colors we know of. And also using the range of wavelengths that insects can see (all of them, not only UV) to combine it into an image using our range of colors to represent what a flower would actually look like to something with that range of vision. I would suspect flowers are far more interesting that way.

[@natejennings4107]

Lift Pizzas Derek actually did put in the ultraviolet colors. It's your fault you can't see them.

[@KuraIthys]

Well, the problem with that is those insects are tetrachromats. As Trichromats we simply lack any context for that, and they'd see billions of colours to our millions. It's like trying to show what colour vision looks like to someone who can only see in black and white. There just really isn't any reliable way to do it that has any real meaning.

[@jetison333]

KuraIthys grabbing three channels instead of just one would be better though

[@xenontesla122]

They would need an even more specialized camera for that kind of video. It may be easier to do with this type of camera by using multiple filters and combining separate photos, but they couldn't capture video.

[@realw98]

I'd like to see in an "extended" diapasone, if we can map IR to the red channel of a video, visible light to then green channel and UV to blue.

[@andrewlazy662]

Idk what up with me, but the way you say "ultraviolet light" is sooooooo pleasing?? satisfying????

[@VaanaCZ]

It would be also amazing to see "The World in Infrared"

[@zx3215]

VaanaCZ, which one of them are you interested in?)) for thermal infrared see the famous Predator movie, although the way Predator sees the world depends on the chosen temperature scale =/

[@xponen]

@zx3215 , no the Predator's thermal camera is a FAKE colour, if you want to see the real infrared image google "Infrared Photography".

[@wilconbarro3469]

wii remote has infrared camera built-in

[@zx3215]

xponen_ everything in non-visible bands is a "fake colour" (quite expectable, because "colour" only refers to whatever is visible), depending on which color scale you choose. what you first find by googling "infrared photography" is gray scale images. For thermography it is also the most common one (the brighter = the warmer). I forgot the name of the scale closest to the one used by Predator - I guess, FLIR call it something like "medical" scale. What is good about it is that smallest temperature gradients become visible. Though the overall scale is somewhat inconvenient to use.

[@XZYSquare]

xponen_ while you can consider the red and blue visualizations of the spectrum fake. Stop and consider the idea of remapping a black and white value from -1 to 1, to a color value such as red 0 to 255. It would show up as a red gradient on the screen. Now instead of mapping it to one color, lerp it; remap 0 to 1, blend from blue (0) to red(1) and what do you get? A gradient from blue to red. But what if we input the values of the UV light instead? "Fake" thermal images.

[@hawkeyes4768]

this is probably the best video i seen all year

[@KiryokuYT]

The world in infrared is insane too! I used to do infrared photography in college and the processing of the film was a lot different - in order to make the infrared film actually work, you need to use a red or orange filter, whatever that film - or I think your application - calls for. The way the pictures looked, though, were absolutely surreal. Leaves on the trees look white, the sky looks black, and no app trying to mimic this will ever truly replicate it.

[@jaseastroboy9240]

You can get most DSLR cameras modified to remove the IR blocking filter. That way you could revisit the IR experience in real time. The sensors are usually quite sensitive to IR light hence why the manufacturer adds the IR blocking filter.

[@KiryokuYT]

@@jaseastroboy9240 This is awesome!!! After you get the filter removed, I'm assuming you need to use a red filter, correct?

[@jaseastroboy9240]

​@@KiryokuYT Yes, you would need an external filter that will allow the infra red through and block other frequencies.

[@KiryokuYT]

@@jaseastroboy9240 You are awesome! Thanks for all the information!

[@squidwardo7074]

maybe im wrong but IR is emitted from anything that is hot so the tree leaves must've been hot compared to the sky?

[@SpaceXToMars]

Let wish that PhysicsGirl (Dianna) feels better soon!

[@_Bandit88]

Black veritasium from alternative reality.

[@L00PdeL00P]

69 likes kek

[@annehinrichs22]

All the bees think we're painting our faces black😂

[@DarkTemplar8952]

If they saw only in ultraviolet, then yea. But they actually have pretty similar range as we do, just shifted towards ultraviolet, meaning, UV to them is like our purple, and they can’t see red at all.

[@J45Russ]

Insects only see UVA. It is interesting to see flowers in UVA. Some point to nectar in UVA.

[@ADIP1598]

Next Episode: The world in Infrared

[@izuix5629]

www.mattlumine.com/kate-ballis-candycalifornian-landscape-infra-realism/

[@martialme84]

+Adip1598 Yeah that was my first thought aswell...

[@Drkwll]

That's just thermal vision.

[@Alien1375]

ADIP1598 So like Predator vision?

[@martialme84]

+Drkwll ...aaand? I don´t get the point you´re trying to make. Also: what do you mean by "just"?

[@glasslinesmadhes]

UV and visuvals clearly explained. I love this video for its simplicity and clarity about UV .

[@DreckbobBratpfanne]

It would be awesome to do this for other wavelengths too. Maybe a 4 parts split screen with visible, UV, infrared and microwave or x-ray cams.

[@NocturnalCoder]

maybe after they find a cure for cancer

[@shubinternet]

I could see UV, visible, and both near and far IR. Or maybe UV-A, UV-B, and UV-C, plus visible, and both near and far IR. I think X-Ray and Microwave cameras would be harder to do, at least without risking causing damage to the people in front of those cameras. Who wants to be cooked by your microwave camera?

[@DreckbobBratpfanne]

@@shubinternet but would you cause damage if you just measure It? There is some radiation in the "wild" too after all

[@shubinternet]

@@DreckbobBratpfanne -- you would first have to define what it means to have a microwave "camera" or an x-ray "camera". At least when it comes to x-rays, all the sensing systems I know of require that they generate massive amounts of their own "light" which they can then "see" with their x-ray sensing devices. If you're talking about picking up things based solely on the background radiation (like we do with visible light), you would find that there's a problem with the signal to noise ratio. Radio astronomers deal with this issue, but then they have giant dish antennas that are hundreds of feet in diameter. I don't think you could use those as your x-ray "camera", because you couldn't transport them. It's an interesting idea, but I think there's a lot of basic challenges you would have to address there, as you get further and further away from the spectrum of visible light.

[@DreckbobBratpfanne]

@@shubinternet seems like it yes. But the results would be quite interesting I think if it's possible to do

[@benoitm2810]

Awesome video. And your editing skills are really good

[@christianstelmakh]

this veritasium soundtrack is so cool it instantely makes me 10x smarter everytime i hear it

[@cjspellsfish]

We rarely study UV (with enough detail) in schools, but you were right, it is a lot like visible light (which we study more), so this video is very easy to understand. I also noticed some similarities with sound waves, *I wonder if "the shorter the wavelength of light, the more likely it is to bounce off tiny molecules in our atmosphere" **9:10** is something similar to high-frequency sound waves falling off faster in reverb?*

[@ussi]

In uv you look like Clint Eastwood

[@idc0133]

ussi just wanted to say the same

[@Squiderify]

I thought of Elon Musk

[@rubimuzakki]

More like Jude Law

[@al_kaloid]

Jude Muskwood?

[@missclarestube]

Facinating how melanin protects the dna

[@beaumotion6692]

My realization that tonic water glows is when a bartender at a bowling alley got my Gin and Soda order wrong and it was suddenly glowing under the UV lights. It freaked me out and I showed the bartender like can you believe tonic water glows??! He didn't really care lol

[@Muropfel]

I may be late to comment, but this summer I put on sunscreen for the first time in a very long time (pls don't judge) and I could literally feel that it works. The sun did not "sting" as much on my skin

[@russianyoutube]

That does not sounds healthy lol

[@robertorivers3453]

It is quite sad how the UV image at 1:20 is kinda realistic nowadays in some cities

[@bobwannabe9141]

More like Minecraft on a low render distance

[@user-pb4bn1eb2j]

Bob Wannabe lmao

[@JaskaranMega]

Imagine seeing these cities in actual UV, total fog

[@protheon]

Kraków in Poland is looking like that in winter

[@VictorSokolovNN]

Damn, at first i thought I have a superpower, like my sight has evolved to be able to see in UV ))

[@dmnkllr22]

"Wear sunscreen. If I could offer you only one tip for the future, sunscreen would be it." - Baz Luhrmann (Everybody's Free) The more you know.

[@PantsB4Squares]

Cause knowledge is power! 🌈

[@memethanYT]

I'm super allergic :(

[@ChadMojito]

What about animals such as rats who can see visible light AND uv at the same time? how does it work? does it blend somehow?

[@GeekIWG]

Yeah, probably like red green and blue blend for us.

[@verward]

I think they just have a fourth receptor, so it's just blending in for them.

[@ChadMojito]

neat. I wonder what it looks like. also, could the human eye be enhanced to be able to see UV light?

[@KuraIthys]

Could the human eye be enhanced? Yes. Sure. A bit of genetic engineering and some tweaks and we could easily modify ourselves to see both near IR and UV. But... Don't get too excited - you'd have to modify your brain too. Because as it is, your visual cortex wouldn't have a clue what to do with the info. If you were born with it, you might manage, but even then... There are tetrachromats in the world. Very rare, but you do find them. (thanks to genetics it's only women). They can't see in UV, generally, but they can see extra shades and colour compared to the rest of us. (they are to most of us as we are to someone who is colourblind.) All well and good but without special training they actually can't make use of their extra abilities and perception. And ideally you'd need that training in childhood. While we're at it, our retina can already pick up UV light, but our cornea filters it out. (for good reason, because it would cause permanent eye damage over time.) That eye damage issue does make things a little complicated. - Solving it is harder than just giving us the ability to see UV in the first place...

[@ChadMojito]

KuraIthys yo, we need a video about this. this is fascinating

[@puh8825]

10:22 I think that's what makes science so interesting. Being able to not only learn it, but also experience it.

[@SFYN..]

I, as a person who is of Indian decent, am happy to see these people turn Indian for a while. It's wonderful how just the skin color would make me think.. oh hey they are normal regular Indian usual people.

[@DukeOfEarle88]

"Virtually nothing absorbs in the UV..." Oxygen/O3: 😑👍

[@ericeaton2386]

That's why the ozone layer is so important

[@sallmandar1027]

Ye, but ozone is super high up in our atmosphere so we dont really see it... also low frequency UV light can go easly trough the ozone layer

[@theincarnateofkurro]

i just wanted to understand this comment and its replies im dumb

[@josevitorag]

@@theincarnateofkurro the ozone layer is our ultraviolet shield

[@begemotowa]

@@sallmandar1027 we don' really see CO2, O2 and H2O gas either. And low frequency UV is less harmful.

[@laaksonensini01]

He is so happy. Makes me smile every time I watch him.

[@bigpharmasports9120]

My explanation for the haze before I watch the rest of the video: We tend to use infrared light in order to penetrate the dust and clouds of space that visible light cant get through. We know infrared wavelengths are longer than those of visible light. Logically it stands then that the shorter the wavelength of light, the tougher time it has of getting through particles, vs the longer the wavelength, the easier. Thus, the super short wave lengths of UV light have an even harder time penetrating what visible light can navigate in the pollution in the picture.

[@vitocorleone3764]

"It likes the smell of you" *awkward look-away *awkward look-away I so ship it

[@MasterRoshi1231]

Vito Corleone even in a committed relationship, us nerds get socially around attractive individuals.

[@Not.Your.Business]

was looking for this

[@jacobgasser377]

Maybe im remembering wrong, but I thought Derek was married? He isn't wearing a ring in the video, but I swear he's mentioned it in previous vids.

[@abdulazeez.98]

jacob gasser As fas as I remember, he's indeed married and have two children.

[@hfdsa9758]

8:12 Justin Trudeaus daily skincare routine

[@safwanshahriar4108]

@@AAbdel-lf4xx I live in Bangladesh and I know what it is surprisingly, thanks to south park. Let's just say I'm cultured enough.

[@oxox491]

@@AAbdel-lf4xx yea most people won't get the joke

[@baltulielkungsgunarsmiezis9714]

@@AAbdel-lf4xx What I dont get is why did he paint himself black to play Aladin, when aladin is closer to white than black. He should have just made his skin light brown.

[@gamerdio2503]

@@AAbdel-lf4xx "I only deal with jokes that few know. Have you ever heard of Trudeau? Didn't think so."

[@Kelan_X]

Lmfao

[@goldenpudding8270]

Its confusing how in some shots his teets are purple and in some arent

[@nulian]

Maybe they also pointed a UV lamp on his teeth. And his teeth are highly UV reflective.

[@brettcrumpton891]

maybe one is more of a filter rather than an actual UV camera

[@tenshikeki27]

My migrant grandma would always say 'going to brush my teets'...it never got old🤭

[@kellynolen498]

@@brettcrumpton891 maybe but most hate to be they didnt align perfectly when he moves between them i assume this is because the didnt get the angles exactly the same

[@RFC-3514]

@@kellynolen498 - It's two cameras shooting at the same time, the angle can't be the same, they'd have to overlap (conceivably, they could use prisms to split a single beam to two sensors, etc., but that would be far too much work for a KZbin video).

[@dygdk]

There is no way this video is 5 years old?! My memory tells me it cannot be older than 2 years old. Crazy!

[@fedusenko]

"why is this fly only attacking me?!" "It likes the smell of you." [Looks away bashfully]

[@DuluthTW]

One of the best collab videos series I've seen. Thanks!

[@xenon9200]

you should do a video on other wavelengths, IR, microwave, xray, gamma, radar, if possible

[@skepticmoderate5790]

Lol a radar camera would be very blurry.

[@connivingkhajiit]

Gamma and x ray would be pretty much nothing for earth

[@lose9596]

Who is the brave one who proposes himself for the video on gamma rays?

[@DrAndrewSteele]

If you’d like to see the world in infrared, check it out here: kzbin.info/www/bejne/fYSzemmEe7iNg5I

[@DlolFace]

1:25 it really looks like that one old COD Modern Warfare Mission

[@solitude.5283]

Having experienced infrared photography, this was very exciting to watch. It also explained why my photos had almost no haze in infrared. Thank you, Derek.

[@brawnstein]

Last time I was this early , Meter was defined by Platinum Rod .

[@veritasium]

Saif Khan lol

[@brawnstein]

+Veritasium now that I'm fortunate enough to have a conversation with you , I have a confession ........ Element vertasium has atomic mass - i and atomic no. - 42 so..... it is an exotic isotope of Molybdenum!!!

[@pegasBaO23]

Nice observation, also nice profile picture. PS: the game it comes from is also nice spent my off time playing it last summer

[@brawnstein]

pegasBaO23 Thanks , the game was one of the few infinite masterpiece on play store .

[@pratishtha1437]

Saif Khan what's it called?

[@vtron9832]

Please do Infrared next time, this was awesome

[@LetiziaCamboni]

I cannot believe I guessed the Rayleigh diffusion phenomenon. I'm trying to train my brain to understand colours better and I'm happy you put it to the test. 🤗 Thanks for this video ❤️

[@Atypical-Abbie]

You look 20 years older with UV light, you look like you belong in a Tarantino movie.

[@_Killkor]

Time to see in infrared...

[@bartsshorts]

alans snackbar

[@FLooper]

9:32 Half-Life 4 confirmed! ... wait ... wrong century

[@jeromesurffoil7033]

Lambda Resistance!

[@fy7589]

Lmao, you made my day sir! Thank you!

[@prabh_G24]

Awesome sir dr. Derek muller, you made science so interesting!! I have watched almost all your videos and I am studying in high school 👊🏻 By watching your videos, it helped me to understand how some things work... Thankyou very much 🙏🏻❤ love from India 😊

[@adityadadhich9384]

Prabhjit Sokhal that might be quite extra for you coz you're in high school (assuming 10+2)

[@prabh_G24]

Aditya Dadhich yes, sometimes the things i don't understand,I ask my teachers or search on internet for extra knowledge 😊

[@adityadadhich9384]

Prabhjit Sokhal good you're amazing curious boy.(BTW-NEET/JEE)? God bless you!!

[@prabh_G24]

Aditya Dadhich Thankyou very much 😁 I am preparing for JEE ✌🏻

[@IndianTiger-0P]

Prabhjit Sokhal Who else see Modi Modi.... in comment

[@nolan4000]

1:06 Once you take a closer look, Jessie, you find... Heisenberg.

[@0mGFaiL5]

Cutest laugh ever at 2:30

[@bilalhossain55]

am I dreaming? veritasium videos in back to back weeks awesome

[@rpow6861]

Poor Dianna, get well soon.

[@KaitouKaiju]

8:07 That smooth melanin! This is why black don't crack.

[@martellmarshall2152]

most definitely

[@niceguy1965]

You know whats funnier, we cannot tell the true collors we could see in UV, because well, UV is outside of our spectrum of visible light, so to counter this we use cameras that use colors of our visible spectrum to kinda bypass the limitations, but even so we still cannot tell how the world would ACTUALLY look like.

[@Neutrino2072]

3:02 C'mon, we all know it's actually Nuka Cola...

[@기다님]

Ok buddy

[@Neutrino2072]

@Élégante personné Exactly

[@frankzatank7382]

Breaking news: Physics girl caught doing black face in 2018! Her response will shock you!

[@tysaylor551]

I literally just learned how sunscreen works.

[@ForestFire369]

I LOVE that you used the tree to demonstrate energy transfer, that was really cute hahaha

[@pablogalbraith]

2:30 that laugh was so weird but it made my day

[@Gokira666]

It's adorable!

[@finnbrewer8986]

That laugh when the bottle sprayed open 😂

[@Ashishsharma-fw8nu]

Uh hoo hoo huh huh huh

[@vasundhara8596]

why is nobody talking about the cuteness of harp seal pups? i died.

[@yusha1059]

bye bye old man

[@kuriptoni]

damn i just realized that it's called "ultraviolet", because the color with the most energy is violet, so they decided to call a wave with more energy than violet an ultraviolet.