Only some humans can see this type of light

[@Phlebas]

This video just made me realise that I _really_ need to clean my monitor.

[@teagan_p_999]

Same, my monitor is disgusting and all I can see is the filth against the white youtube page...

[@Solafar_VB]

yeah my screen is a mess

[@AydenRose04]

Teagan P lol i have the dark theme

[@cainoble]

Lol

[@CrazyBear65]

Realize is spelled with a z.

[@johnabbottphotography]

As a photographer, the qualities of light have always astounded me. Its a never-ending rabbit hole of science.

[@thomasewing2656]

Optics is key with astronomy. Polishing glass to boggling tolerances is fun.

[@matthewwriter9539]

Science is full of rabbit holes...and now for some reason I feel like looking up information about a rabbit's digestive system...

[@vickypedia1308]

@@matthewwriter9539 rabbits have interesting digestive systems. It requires them to eat near constantly, because if the guts stop moving they can get a blockage and die.

[@rdblocks5490]

And the hole travels faster than you

[@mayganphynix8267]

"Science Rules!"

[@intellectus2826]

I remember as a child I broke a calculator and discovered that its LCD digits can only be viewed by a thin plastic film cover. For years I kept wondering how much of this world is hidden behind films like that.

[@Dropla]

could be a reason some can't see the things, some people call ghosts. some people can see them, some can't. Interesting thought. Maybe also, some people say the typical grey alien description, with the big eyes, aren't eyes at all, but, lens coverings for an eye behind that. Maybe they help them see things like this, that would otherwise be invisible, that would be interesting. Possibly why they say pets react to & can see spirits too.

[@TrevorPhillips2024]

@@Dropla very cool ideas maybe could be cool to integrate into fictional short story form could be fun

[@theincrediblehibby8239]

@@Dropla Ooooooooh I love this!

[@mrpandasian8871]

@@TrevorPhillips2024 that could give birth to a pretty sweet Halloween themed d&d campaign

[@AstorThalis]

@@Dropla Ghosts and spirits don't exist.

[@nicklockard]

We did this in polymer engineering class, and I always thought it so cool. Years later, I gave my operators polarized safety glasses so they could see certain defects in tempered, parabolic segments of glass. It worked too well! They saw everything and started rejecting stuff that was in-specification, lol.

[@mikemack7933]

What type 9f engineer are you

[@since1876]

I guess, in that case, specifications should be a little more strict 😜

[@Daysed.and.Konfuzed]

I found out about the LCD sheets and what they can do, by myself, when I was a little kid in the '90s, by disassembling and reassembling a Gameboy. It blew my mind! I got the polarized sheets from the front and back of the display and made a pair of glasses with a frame of paper cut out. People would see me wearing that ridiculous thing while playing with a Gameboy that was clearly broken ('cuz they couldn't see any images, only hear the noises) and they would think I was a little odd. But when I showed them how I could see the game through the glasses - then they were sure that I was indeed really odd. One cool thing not mentioned in this video is that if you put the sheets against the transparent screen and press a point with your thumbs it creates a quick colorful wave around that point. 𝑻𝒓𝒊𝒑𝒑𝒚. ☼‿☼

[@avatzajadeh]

@MIXEDUPWORLD when I was a kid, there was no trail effect by doing so. only buzzing electrons. statics. and weird smell.

[@amandawilcox9638]

@MIXEDUPWORLD re: Fingers on your old style tv? Glass- razor sharp when broken- and usually DUST! Lots of it.😂🙄🤣😊

[@ninjawafflezz5356]

I had a few different old TVs growing up and these comments are nostalgia

[@Malaphor2501]

I had a friend that would frequent LAN parties do this with their monitor to prevent screen peaking from other people.

[@Daysed.and.Konfuzed]

@@Malaphor2501 Now that's next level 1337! XD

[@duncanward6226]

Look at this, turn your head left and right ::cuts away from thing you just told me to look at::

[@TheMartianReport]

you're expected to pause :p

[@user-vx1wt4hb5l]

pause video

[@rainedaywoman]

Except when ya pause the screen greys out.

[@davidhenderson3400]

@@rainedaywoman Must be your set up. I just get a white screen. Do other videos on KZbin grey out when you pause them?

[@ThrottleKitty]

KZbin has ALWAYS grayed the screen out when paused for me, across 3 PCs and 3 phones totally 4 operating systems and 3 web browsers. It's impossible to even do the thing they are asking you to do, it's like this video was made by 14 year olds.

[@dirtybiology]

Thanks for the collab Dianna, it was super fun ! Nice snowboarding skills, too :P

[@matthieuledoux651]

Plus de collabs Léo ! On t'entend pas beaucoup parler anglais !

[@thomasschwartz7921]

À quand une collab avec des youtubers polonais ? :3

[@remyprayal1552]

J'ai compris que ta partie

[@sxwvncf4702]

Cette accent 😍

[@JvnCrtl]

J'aime beaucoup ton accent et le contenu ! Ça fait plaisir de voir deux de mes youtubeurs préférés dans une même vidéo. J'espère que cette vidéo pourra t'apporter des abonnés car ton contenu est vraiment génial.

[@Milosz_Ostrow]

I accidentally stumbled on this effect many years ago while driving a Volkswagen Beetle. I looked into the centre rear-view mirror and was shocked to find that the rear window had crazy rainbow-coloured blotches all over it. However, when I took my polarized sunglasses off, the effect disappeared. I later learned that it was a bad idea to wear polarized sunglasses whilst in the cockpit of a plane, because the same effect can occur with an acrylic windscreen, severely hampering a pilot's visibility and creating an unsafe condition.

[@stargazer7644]

The bigger reason pilots don't wear polarized sunglasses is it will blank out cockpit displays.

[@brianwright9514]

Well, that and the fact that you don't really have to worry about glare from horizontal surfaces while flying.

[@JosephHHHo]

@@brianwright9514 they see all the same horizontal surfaces and more, including glints off of other aircraft which are very important not to miss... so they can be missed.

[@geometricart7851]

for me it was the magnifying lens sheets stuck on windows in the 80s to see blindspots in vans. LOL

[@MacNerfer]

Sunglasses and car windows do things like that, probably because tempered car windows are made of multiple layers.

[@bassunderscoreharmonic6689]

Now i know why people think im crazy when I talk about the "iridescence" in light

[@empireofpeaches]

My kid freaked me out when he was younger and was staring at a light saying "I see all the colours"

[@Hysube]

Right, I always thought people could see the rainbowy patterns on plastic ware...

[@surelock3221]

@@Hysube I don't see it in most plastics, but occasionally I do. I always just assumed that those plastics were different, but the effect is so faint I hardly ever notice it and don't point it out to people

[@Hysube]

@@surelock3221 I don't either I was just unawares of those who couldn't see it lol

[@fangstriker4791]

Yeah same I thought everyone could see it

[@CriticalMonkey623]

I found this out by accident while wearing RealD 3D movie theatre glasses at home once and eating a freezie (one of those frozen tubes of flavoured juice that you give to kids, if you don't know) and I looked at the clear packaging through the glass with my monitor in the background and it blew my mind. I spent like 20 minutes just rotating it and trying out different pieces of plastic and I was firmly mesmerized. I looked up some explanations online, but this video is one of my favourites. Awesome content.

[@vicentewoolvett8306]

You must eat a lot of carrots, I don't see anything. (Literally, the pigments thought to be responsible for this come from carrots)

[@allenpan]

So much fun!!! Thanks for coming over Dianna! Sorry my place is such a mess 😅

[@physicsgirl]

I'd expect nothing less.

[@GildasCotomale]

No matter the place provided you have fun ^^

[@TamagoyakiDog]

Nothing is THAT fun... omg! I wish I could become toddler-euphoric over some pretty colors. No shade tho 😎

[@rafabonati7757]

I tried moving closer to the screen and realized that the yellow blobs became much smaller. Then I moved a few feet back and the yellow blobs were now much larger. You don't need to look only in the middle of the screen. The polarized light blobs can be seen anywhere on the screen. Wherever you look, they appear. Just tip your head and they move back and forth! I now feel confident that I can travel with the migrating birds and sea turtles. Thanks Dianna.

[@MacNerfer]

Hmm, nope, didn't work for me. I wonder what percentage of humans can see it. Edit: now actually I do see some yellow - for me it helps to tilt the laptop rather than my head.

[@rafabonati7757]

@@MacNerfer - You will need your laptop to be able to migrate with sea turtles and birds.

[@Hanayancey]

Didn't work for me

[@joenaveau]

0:07 "I'm here with my friends" Friend just casually putting tape on other friend's face.

[@anarchyantz1564]

As long as its not duct tape you should be fine. Unless you are into that sort of thing, but hey, we dont judge!

[@lgooch]

@@anarchyantz1564 yea

[@bikdigdaddy]

@@anarchyantz1564 shall I say r/wooosh ?

[@glkglkglkglk9193]

That's what friends are for....

[@amberkat8147]

@@anarchyantz1564 Duct tape is over rated. Except on lips- don't let it touch the inner part of your lips. I tried using duct tape to remove hair from my leg once, and it didn't work.

[@TheAdaaamski]

That transition to dirty biology was super slick

[@ViperCannabis]

ikr, they went full Vsauce :D

[@freddy_boi_5642]

I would go watch is channel if it wasn't all in Frenchfries

[@freddy_boi_5642]

*French

[@cdemr]

@@freddy_boi_5642 You can enable subtitles on most videos

[@Master_Therion]

I can't wait to read all of the arguments in the comment section. This video was very polarizing.

[@IceMetalPunk]

Oh, hey, your puns are here, too. I almost thought you were only around in the SciShow comments :P

[@jackielinde7568]

I wave off your criticism, since it's out of sync with the modern perspectives.

[@kittybeans8192]

Personally, this video resonated with me very well; maybe you're just not on the right wavelength my friend... if you just open your eyes, I'm sure you'll see the light.

[@Master_Therion]

IceMetalPunk I'm glad to see you here too, Physics Girl is great! Fun topics and demonstrations. SciShow has a regular upload schedule, so it's easier to pun around there :)

[@Master_Therion]

Justin Polar bears at the North Pole... now just wait a Dipole Moment there... (Chemistry joke, probably too obscure to be funny)

[@eMJay0296]

Something really interesting, not mentioned in the video: the yellow-blue Heidinger brush also is visible in nature at the sky. It stands perpendicular to the sun, best visible for a brief period of time during sunrise and dawn.

[@swatson1190]

I have tetrachromacy. I see colors that you can see.

[@1000Subscriberswithnovideos69]

Only some humans can see this type of comment.

[@CapsAdmin]

hello people who scroll down to view comments on a video

[@j3ffn4v4rr0]

Dang, I can't see it :(

[@friedmule5403]

Ehm what are you replying to? :-)

[@Baleur]

I know lol why do they say "some humans"?

[@GlitchedBlox]

What did you say? I can't see you!

[@craigcorson3036]

Diana, your enthusiasm and child-like delight at all things physicsy always put a smile on my grumpy old face. Your channel is worth more than you realize.

[@jacobshirley3457]

Curiosity. Only thing not holding children back.

[@kblewis3331]

@@jacobshirley3457 Lack of curiosity is what holds us older folks back... (aka adults). I'm glad I still maintain a strong sense of curiosity.

[@logandanhier]

dirtybiology = best french science youtuber

[@boresolenne9468]

Logan Danhier i agree but I which he makes more videos T-T

[@pixel_vengeur391]

To me, it is Bruce from e-penser :D

[@DreamexDMX]

Pixel_Vengeur Bruce déçoit un peu depuis un an, Léo propose tellement de qualité de mieux en mieux en plus ! Mais on a de bons scientifiques sur le youtube FR

[@pixel_vengeur391]

Je ne suis pas de cet avis, mais je le respecte. Y'a un truc chez Bruce que je ne parviens pas à m'expliquer, et que je trouve que Léo n'a pas, peut-êter un cynisme ou l'autre, je ne sais pas.

[@flo-fh8kk]

I prefer "science étonnante" but Léo is very good

[@stevemaserang7765]

I hope you get well. It breaks my heart to hear of what you're going through. I absolutely love your content, and love your energy. I wish wellness for many years for you and your husband.

[@MsBlulucky]

I didn't see anything, but my neck made some weird crunching sounds...

[@Baekstrom]

Me too

[@zenokarlsbach4292]

Surprise. I saw it very clearly both yellow and blue. I'm having my day now!

[@RoseyRosies]

were you wearing glasses?

[@MsBlulucky]

@@RoseyRosies I do own glasses, but I can't even remember if I wore them yesterday, let alone a year ago 😂

[@zenokarlsbach4292]

@@MsBlulucky meh

[@bigmanvictor6911]

“Hey can you see this light?” “Dude I’m blind”

[@michaelfitt2844]

IgnitedZucc 25 was going to post this but you kinda beat me. kzbin.info/www/bejne/najKgIiwpMmGbKc

[@OlafDoschke]

This isn't a physics girl video, this is a video of a guy called Léo watching a physics girl video. Almost like Inception.

[@pierregarcia4752]

Olaf Doschke kzbin.info/www/bejne/hYPdnJ2OnJuAas0

[@redbird82ify]

If you have a 33.3 rpm record, put two strips of adhesive tape radially (center to edge) across the tracks and press them into the grooves so the adhesive copies the grooves. You now have two polarizing lenses. Put one on a piece of acrylic, the 2nd on another and experiment. The lines in the adhesive will act as polarizers.

[@flori8320]

Wait what!? dirtybiology !! Cocorico !

[@boresolenne9468]

He told us about this collaboration in his last video and that's why i was so frustrated when the last video of physics girl came out

[@arkaiss5125]

cock-a-doodle-doo! lol

[@GigAHerZ64]

One of the coolest part is having 2 polarized filters so that nothing passes through... and then adding 3rd filter between them and all of them become transparent once again!

[@iau]

joonatanu Wait, seriously? How does that work?

[@Quismo12]

I'm not sure if that happens. Let me check

[@JimSteinbrecher]

they dont become fully transparent, the middle filter just "refreshes" the polarization and allows some light (but not all) to make it through.

[@Crazy_Diamond_75]

iau Say filter 1 is vertical, all light coming through it is now vertically polarized. Filter 2 is 45-degrees diagonal. Equal portions of the light is either let through or blocked (vertical light can be broken up into 2 diagonal components). Filter 3 is horizontal. Once again, equal portions of the light coming through the diagonal filter is either let through or blocked (diagonally-polarized light can be broken up into vertical and horizontal components). So you basically use the middle diagonal filter to "rotate" some of the light so that it can then pass through the horizontal filter. Edit: Keep in mind, vertical and horizontal are relative to your reference frame which is arbitrary. Nothing is inherently _vertical_ or _horizontal,_ it's more about measuring perpendicularity. A photon that is polarized perpendicular to its filter won't pass through. Otherwise, it has a _chance_ of passing through.

[@zeHatWearingMan]

Its because the light only cares about the difference between both filters. The equation is cos^2(theta), theta being the angle between both filters. So if you have the two filters at 90deg from each other, then it gives you 0% light exiting. If you have a middle filter then you have 45deg from first to second which gives you 50%, then second filter to the last gives you 50% again, which is ends up with 25% light at the end.

[@3800S1]

Anyone ever noticed the stress areas on some car tempered glass windows? normally I see them as a grid of circles from where the flame heads heated the glass during manufacture. They get darker and lighter inversely somewhat when tilting you head.

[@physicsgirl]

Never noticed. But now look crazy doing the head tilt cross-eyed looking at my car window. I’ll keep an eye out for this though

[@ashChad]

omg I thought I was the only one, funny I didn't make the connection when watching the video but at least now I can learn more about it.

[@RustOnWheels]

Yeah whenever I drive with polarizing sun glasses it gets so strong that I have to not try to look at all the different patterns of all the different cars on the road.

[@3800S1]

look at it through polarized film or glasses. Does the same thing as the knife and fork did in this video.

[@sarahboolala]

I was wondering what that was!!!

[@ANTheWhizkid]

Cool content! A few years old and still interesting. Hey, in photography we use circular and linear pole filters for lenses - mostly, to eliminate reflections (water surfaces, windows, and so on), but also as tool to enhance the color contrast. (λ/2 - λ/4)

[@kevinmcnoodles5600]

Just FYI to everyone, the sheets are pretty cheap on amazon. Make sure to check the reviews though. Some are sold alone, some in packs. Some are 6in x 6in, some are 3x3.

[@TheSam1902]

KevinMcNoodles If you don’t wanna w8 in the mail you can salvage old laptop screen from their filters with a good cutter and a steady hand. There’s a tutor on Instructable

[@erikziak1249]

I agree, that is the best way to get them. I disassembled more old LCDs from defective notebooks with damaged screens like more than 10 years ago.

[@sexygfx4080]

you can see those colors aswell when ur on LSD.

[@Ferchi.]

SexyGFX true

[@lawrencewashington9901]

I was just thinking that when they showed the spoons lol

[@Acetyl53]

You can train yourself to see quite a range of things. It's similar to the Tetris effect. With a few exceptions, anything you make your brain do for long enough will eventually become fairly automatic.

[@preetykumari3961]

I have seen it on my migraine medication

[@marsbase3729]

Ah, the good old days...

[@zoémarti-dr]

Wow, as a French viewer, I wasn't ready to see Leo from Dirty Biology. Thanks to share other channels than English languaged ones. Great video by the way

[@paulofilipe8960]

2:45 Physics Girl: I am moving up and down side to side Lando Norris: Like a rolercoaster

[@KeefyKat]

Another weird thing about polarization is that as you add more layers of the "tape", it actually can let MORE light through than fewer layers. It can get VERY weird and unintuitive.

[@MikaelMurstam]

ok I feel this wasn't explained clearly enough so let me explain: 1. The first polarized film filters the light so they all have the same polarization/direction. 2. The tape then refracts the light differently depending on wavelength/colour, but since they all started out in the same direction all light of the same colour is now twisted the same way. 3. Finally, the second polarizing filter now sorts out the light of one particular direction and since we determined that a particular colour now have a particular orientation, it's going to let through a certain colour. It's the nanoscopic air-gap that refracts the colours, just like oil on water but since the distance is not perfect and they used more than one layer you will see other colours as well that will have the same orientation but be of a different colour.

[@kblewis3331]

@Mikael Murstam, Thank you for additonal expanation!

[@LMacNeill]

Want to *really* blow your mind? Put two polarizers at 90 degrees to each other, so all light is blocked... Then insert a 3rd polarizer between the two -- and you'll see the light coming through again!! 'Splain how three polarizers block *less* light than two polarizers!! Go Google that one -- it's a really cool explanation.

[@marios1861]

It's bell's thoerem yall

[@Riiisuu]

Mariano Ntrougkas but the point is that it’s so counterintuitive! From face value it seems non sensical. The 2 initial filters block all incoming light. So adding on in between shouldn’t change the outcome...or so it seems

[@EstrellaViajeViajero]

@@Riiisuu I think it's counterintuitive because most people would expect the 3rd filter to be added to the end (after the light has been "cancelled"). If you put it in the middle, it would probably interfere with the cancellation, so then it's unsurprising.

[@Riiisuu]

Ryan Stallard but most people would think that it would increase the percentage blocked, not decrease

[@jakehix8132]

@@Riiisuu I hope most people would not have thought that. If you think you can increase the blocked light past 100%, I want what you're smoking. Would be sick. "Buy a Flashdark today!"

[@IPODsify]

Is being able to see polarized light rare? I've always liked just looking at things until I got the slight eye burn in and then blinking, the polarized light is really visible if you do that.

[@rainnoaylaa353]

9:06 "variéti" Léo me fait tout de même extrêmement rire

[@The-Cat]

Je pense je parler tres mauvais francais mais j'essayer un peux sans google translateur :p voila je "hope" je dire un "sentence" correct en francais :p

[@Dr.Eximious]

tu as raison, c'est très marrant.

[@Dr.Eximious]

@@The-Cat votre français est très bon! continuez!

[@Tim54000Production]

@@The-Cat not bad at all, the correct sentence is : "Je pense que je parle très mal le français mais j'essaie un peu sans Google Traduction :p Voilà j'espère que j'ai dis une phrase correcte en Français"

[@jesaispasquoichoisircommep795]

Et le fameux "camouflage" avec un bon accent français

[@christianmckee3614]

Nobody: The French guy: Peauleaurizashione

[@christianmckee3614]

5:42

[@morlirstone2165]

😂😂

[@YacineChehri]

DirtyBiology

[@kennethwilliams6916]

Lol true true

[@TomiBonTomi_2.0]

Paul Le Rouge A Sionne

[@PhilEverytHinG]

I see this all the time on shrooms

[@DeltaNovum]

And more! there are colours you see/experience/feel/smell while tripping on psychedelics like Psilocybin or LSD that just don't exist outside of a trip.

[@ryankean9501]

._. …im intrigued

[@AqierDesigns]

Delta Novum true

[@Bingsolomon]

@@DeltaNovum acid is fun

[@bigchunkus5014]

You can be intrigued guys, but just be careful please.

[@richardkev3077]

Crossed polarized sheets. I use that all the time when analyzing minerals. Take a look at pics of thin section slides of rocks taken with crossed polars. Some are gorgeous, most are interesting and unexpected.

[@road2dawn26]

me: oh yeah I'd watch that guy. physics girl: oh yeah it's in french. me: oh....

[@klemmichard8916]

That's a shame, could someone strongly encourage Léo from Dirty Biology to make his videos subtitled in English?

[@AntoineRx]

Lots of his videos have English subtitles

[@ChaoticFerret]

@@klemmichard8916 How awful ! Could anyone strongly encourage english speaker youtubers to make them videos subtitled in English so we can translate them ?

[@onnelaitetrisku1162]

his newest content has often english subtitles that isn't as bad as the accentxD

[@soldatpopol3589]

@Emilio Vicente I think French is quite difficult to learn

[@KeligAvignon]

Didn't expect to see Leo there, his accent made me laugh... But just a bit, I probably can't do better huehue

[@vitriolicAmaranth]

BR?

[@ariesleo7396]

My name just so happens to be Leo and what they’re showing us is basically how LCDs work

[@daimenhazard160]

"...while looking at your LCD screen" * tries to do iー * Clip of them trying it starts...

[@Nurutomo]

about:blank instead Edit: about:blank is command inside browser to show blank white page, you can put in your browser URL

[@DavidLindes]

@@Nurutomo or just pause on that portion... But yeah, that kind of annoyed me, too. (If they told us to pause, I missed it.)

[@rapmastac1362]

@@DavidLindes No warning, actually had to back track twice because the transition was too quick.

[@Bluerella47]

i don't get it

[@Bluerella47]

oh nevermind i get it now

[@Foxiepawstotti]

Seriously one of the most entertaining AND informative channels I have found this year. I love it!

[@sanjaygupta2266]

Hello mam How are you Mind blowing Reply mam

[@AgglomeratiProduzioni]

I find more mysterious why _only some_ humans can slightly perceive polarisation.

[@Guztav1337]

Only only some have color blindness, some humans have faster reflexes than others, only some people are blonde. We are all individuals with different properties.

[@ghhg-je8wv]

Yeah I tried this for a while, I have no YellowCirc pigments in my eyes for sure...

[@nodisalsi]

I discovered I can see it too - I saw what I would describe as "yellow wings" - but not the blue. Really cool

[@livedandletdie]

It's not that strange, some people have a lot more sensitive eyes to light in general. It's for that reason I wear sunglasses all year round.

[@kosukemiura1226]

"Huh I can't see shi- WHAT THE FRIGG"

[@InkDropFalls]

Frigg is mythology

[@applebobbbtakispls129]

I see dis light when I look at my iPad screen but it’s off

[@impart486]

Then ur blind

[@Yathuprem]

Hermione is not happy with Ron and Harry. Hahaha. Exactly.

[@vocalcords7397]

I know words, I have the best words. Nobody respects women more than me. I am the least racist person who you have ever met. Nobody lies better than me. Believe me. Sad!

[@allenpan]

...i'm hermione

[@Yathuprem]

Haha

[@HiopX]

I will now refer to my favourite Science KZbin as Harry Potter Characters: Michael from VSauce would be Neville, cause he can carry this on its own Myth Busters would be Fred and George, always screwing around Mark Rober would be Charly, he worked with fire breathing things Kyle from Because Science would be Bill, cause he's hot MattPatt would be Luna, I blame the nargles Neil DeGrasse Tyson would be Lee Jordan, the Radio host and Carl Sagan is Dumbledore, cause he's the OG

[@Yathuprem]

HiopX hahaha that's nice. 10 points to gryffindor

[@TheRegret]

you could probably calculate how much the light is being bent by the tape by looking at what colors are visible... it seems to follow the complimentary color rule: yellowish orange with blue, green and red (although it's kinda hard to see and it seems to like to switch to the next set instead of stay at green red), and purple and apparently a dark blue/teal and some orange for some reason? idk that last one is iffy cause purple is supposed to be opposite yellow and blue is opposite orange. but all of that is paint color theory so idk how it would work in visible light spectrum as these objects are letting certain light pass through rather than reflect. also it seems at the 45 degree angles the whole thing goes back to clear, so maybe that diagonal light is not getting split?

[@ElleKelsheimer]

Like any self-respecting 20-something, my phone has a crack in the screen. I put a piece of really clear shipping tape on it it prevent the crack from spreading. Imagine my surprise when I looked at it with my polarized sunglasses on and saw this effect!

[@jonnyoates1218]

Dianna, you're amazing!!!! So much energy and enthusiasm. You are without a doubt my favorite KZbin-er! You're simply the best, better than all the rest!

[@patrickstar2813]

i could have Leo talk to me about cat litter and i would be in love

[@Azire]

yeah, he does have that effect doesn't he...

[@TheTechAdmin]

Wait, he wasn't?

[@HunterShows]

I'm impressed that they got through this whole video without saying "wavelength" or mentioning the electromagnetic spectrum. At least I learned kind of what polarization is.

[@ericgillespie2812]

Was sitting in my car watching this and remembered I had a pair of imax glasses in my center console. Water bottles are pretty neat looking lol

[@elzearcontelly2651]

Was not expecting Dirty Biology Not complaining tho

[@didgonedoneitfasho1732]

4:51 "THE NATURAL WORLD IS FULL OF 'FLAT' SURFACES"... Shows a large body of water.... ... . . *geo vs helio argument intensifies*

[@livedandletdie]

flat is where the slope of a curve is 0. And on a sphere every point on the sphere has curvature 0.

[@DANGJOS]

@@livedandletdie what?

[@marios1861]

@@livedandletdie uhm... no?

[@DarkMoonDroid]

LOL

[@chicoti3]

@@livedandletdie Actually, every point on the sphere has curvature different than zero.

[@lilabluestars85]

I keep watching your videos over and over again, everytime they pop up in my KZbin homepage, because every second of each video, I'm sending positive energies for your prompt recovery Diana. We love you, and with all our hearts, we keep wishing for you to get better! 💖

[@LichenJuice]

I see it! I thought I was imagining it because it was so faint, but it looked exactly like they described! Also, I've always wondered WTF was going on with 3D glasses, now I know.

[@animeloveer97]

3d glasses are not the same at all lol

[@LichenJuice]

@@animeloveer97 i'm pretty sure they are tho? I mean those greyish ones.

[@ColwellMarcus]

@@animeloveer97 modern 3d glasses are polarized. One side is vertical and the other is horizontal, so one eye is only seeing half of the two slightly parallaxed 3d images. Some IMAX screen used circularly polarized light and one lens is clockwise and the other is counter clockwise, It creates a less perceived flicker in 3D films.

[@sherifhany386]

my understanding of light just went levels up

[@sherifhany386]

Ooohh she liked it , she liked IT !!! .. hey maaaaa ..

[@JupitersDancer]

Ooooooh Leo Grasset in da place On l'attendait cette collab' !

[@boresolenne9468]

Pablo M oh oui j'ai ete tellement déçu qu'elle ne sorte pas plus tôt. ..

[@GildasCotomale]

tant que ça ?

[@sashagurieva3114]

Pablo M TELLEMENT! Mais maintenant faut que elle elle aille sur dirtybiology!

[@nathanjora7627]

Et elle parlera en français ? (si c'est le cas, je suis pour, à 101%. À 101% parce que je suis à 100% pour si elle ne parle pas en français, mais ce serait encore mieux si elle le faisait, donc il faut augmenter un peu)

[@GermanShepherdDaphne]

I can also see auras and stereograms

[@ronjones4069]

You said that some humans can see polarized light. All humans that are not blind can see polarized light. Most can not detect which type of polarization it is. I know what you mean, but it would be better to have said that only a few humans can detect differences in polarized light, not that they can "see" polarized light. I'm being picky, I know. I love your work.

[@marthanewsome6375]

Agreed, it is not specific to only some people. It helped make it click bate.

[@user-vn7ce5ig1z]

It's meant to be a stereotypical click-bait title, complete with arrow (though missing the cliché red circle).

[@beanyolk]

this is why i always risk reading comments. that really helped clear some things up for me, thank you :)

[@khloerabnta4995]

Ron Jones click bait central round here

[@duke9532]

Cant see it personaly and im not blind or colorblind or anything else.

[@sekaita]

wow! i've noticed this effect before and thought i had an eye defect - didn't know it was actually this! mindblow

[@5roundsrapid263]

fusi sekaita I’ve seen it while wearing safety glasses and looking at plastic objects like car headlights.

[@Stray0]

When I tilt my head very fast counter-clockwise, I get horizontal yellow dots, when I tilt my head very fast clockwise, I get vertical yellow dots. Now I feel dizzy.

[@hiankun]

At first I just smiled at your "fast to dizzy" comment. But with unknown reason I followed it, and then I saw the yellowish dots! When I followed the "tilt slowly" instruction, I didn't notice the yellowish dots. Now I can see it. Thanks. :-)

[@TazPessle]

yeh, it does do something odd... like it rotates in the opposite direction as your head rotates

[@Ekusu11]

I could see those dots without turning my head... at first i was like "what I can see them without turning my head"... and then I realized that was because I was lying on my side while watching the video xD

[@jebes909090]

thats your brain being pounded against your skull as you move. you are died now

[@coryc123]

Thank you for that explanation of how polarization works, so simple, yet so hard to get until it's explained well. Really appreciate it.

[@wildmanofthenorth1598]

The refraction of light is related to the dielectric constant it's awesome for doing 3D art , along with using horizontal and vertical lines of contrasting colors. This brought back a memory of a old art project .

[@stumcconnel]

3:00 you mean... "Diagon Alley" polarised ;)

[@deadalpeca8099]

Nice

[@vocalcords7397]

I know words, I have the best words. Nobody respects women more than me. I am the least racist person who you have ever met. Nobody lies better than me. Believe me. Sad!

[@DesoloSubHumus]

Oh, vocal cords, I couldn't help it. Is it even possible to not laugh at that string of nonsense? We never knew it at the time, but that's why the 'LOLWUT?' meme was created so long ago.

[@CrankyPantss]

Good video, as always. I always love your enthusiasm, Dianna. Thanks for sharing it with us.

[@popsfereal]

I'm 60. I have learned more from your videos in 2 hours this morning than in 4 years of high school science. Thank you.

[@akshaychandrashekaran4078]

Humans can't do it without the aid of sunglasses... Or can we?....[dun Dun] Hey Vsauce, Michael here....

[@pingshi2905]

Wow I’m early but it’s midnight where I am and the only reason why I’m up is to watch an eclipse! It’s cloudy.

[@masitamasita6023]

same

[@pingshi2905]

Sarcastiic Gamer it’s midnight where I am time zones we’re plus 10 gmt or something

[@shinypichu4532]

Its cloudy here too :( nasa has a live broadcast of it though so theres that i guess

[@pingshi2905]

Shiny Pichu yeah I’m watching that lol always be better irl tho 😢

[@andymcl92]

Sadly here in Scotland you can't see it because 1) it's cloudy and 2) it's daytime!

[@naso724]

Is it me or just Leo is so cute and hoott !

[@naso724]

I just saw again this video and I liked myself after a year. Yass

[@pale_blue_ruby]

This girl's energy is literally half of the reason i watch her videos.

[@saucerguy3]

She doesn't stop does she, ha ha.

[@hijodelaisla275]

"literally"

[@amaterasu3099]

Omg thank you ! I've always wondered how the polarized lenses you put on the microscope to examine rocks works ! (D'ailleurs Léo c'est quoi cet accent anglais ?? :p)

[@trixxtreatz]

Physix girl always has the best energy. She makes learning feel like playtime. ♡

[@whynottalklikeapirat]

pervert

[@AirwolfPL]

It's called ADHD.

[@davisx2002]

imagine what she makes playtime feel like...

[@v_naagin3871]

Not like my physics teacher at school

[@miguelribeiro5165]

"Or can we?" Ding Dong, Diana here

[@4tdm]

That's copyright infringement !😆

[@MidnightSt]

Thank you for keeping the white polarized image on on the screen TWICE for about TWO SECONDS EACH. That's certainly enough time to examine if I can see some faint unknown pattern that shows up only when i repeatedly tilt my head slowly from side to side...

[@hollyrosberg4720]

I saw the blue and yellow lights But very very faintly

[@Netherdan]

Enhanced vision: check; Fur: kinda; Preying on small animals: since 3; Always falling on their feet: in progress;

[@fartyperson]

I di d not se it

[@Kie-7077]

I only saw the yellow, faint but enough to know you can definitely see it.

[@beatrix1120]

I also just saw the yellow but it was vary faint and not the same shape as in the video.

[@hongry-life]

I see also a grayish area around it.

[@tibees]

Watching this whilst waiting for clouds to clear so I can see the eclipse

[@thelenny2772]

Tibees eclipse...?

[@quen_anito]

It was surreal... The moon kinda looked like mars.

[@doge2629]

Tibees The super Blue red moon?.

[@jar-jar3806]

You make my day better. I love your energy and appreciate the knowledge you spread, best of luck with your future endeavors!

[@RobB-vz2vo]

When learning to fly I was told that I can only wear neutral density aviator glasses, not polarised glasses. I was taught that is because light aircraft screens are made of an acrylic or, in the case of higher speed aircraft or where laminated screens are required, polyvinyl butyral (PVB) is used. I bought a pair of polarised glasses one day to see for myself and was amazed at how messed up with colours the aircraft screen was. I thought well at least I could use the for driving but no, I saw the same patterns on my car windscreen as it was laminated glass.

[@MateusAntonioBittencourt]

Tip... the further away you are from the monitor the better. I was not seeing it until I pushed the chair back like one meter.

[@anacronox26]

Wow, il wasn't prepared to view a "dirty biologie" featuring on this vidéo. So cool

[@MilkyTheFirst]

its sweet dee with her life more together

[@Weirdpoe]

It was such a polarizing shift from high tone to low tone between the two hosts.

[@1TakoyakiStore]

I thought I was crazy for thinking this! I noticed that the sunshine reflecting off of rivers that are high in tannic acid from the leaves (blackwater river) was bright violet under polarized sunglasses. Yet I noticed I could still perceive the color although much less obviously so. It was the kind of thing you wouldn't notice unless you were specifically looking for it. The same thing happens although to a lesser extent with a blue sheen to freshly paved asphalt.

[@amber2005]

This was awesome! Honestly I love learning about light! You should do more light videos! Anyway loved the video!

[@alhaeri1]

i did some of the Arabic translation if any one would like to help to finish it please do i will continue where you leave it.

[@eldarr0uge482]

I also started the french translation. I'll probably continue tomorow, but it'll be great if someone could give me a hand because I'm pretty sure there will be many other french coming on this video thanks to Léo :D

[@othmana.4506]

hello dear, send me at [e-mail], will be happy to help :)

[@notinterested8452]

It's haram.

[@Kalebfenoir]

This actually explains to me why my cellphone screen goes all rainbow/hyper-intense color when I have my shades on. Between my shades, the screen protector decal, and I guess the screen of the phone itself, somewhere in that there's a weird reaction.

[@TheDanielConsole]

...aaaaaand now i wanna build a round window with rotating polarizing filters.

[@safir2241]

When you rotated the glass I had an idea. Stab something in the middle of both & spin the polarized sheet super fast.

[@NiHaoMike64]

Something interesting to note is that most wireless routers (anything better than the cheapest ones) send and receive radio waves at different polarizations to encode more information into the same bandwidth. Going from one to two nearly doubles the bandwidth, while going even higher only gives incremental improvements since there can be only two polarizations that are orthogonal to each other. (That's why with a router that has external antennas, it's recommended to position the two outer antennas at 90 degrees from each other.) A good visual analogy would be two projectors with orthogonal polarizations playing different videos at the same screen. Look at it directly and you only see a mix of the two videos, but look through a polarizer and by adjusting the angle, you can see just one or the other. (That is how some 3D display systems work.)

[@knapret]

True for some models, but other models with multiple antennas are designed to have all antennas in parallel. Some of the advanced ones rely on other techniques for maximizing signal strength. Check what applies to your specific WiFi router or access point.

[@NiHaoMike64]

I have a cheap Netgear AP that looks like it's polarization domain multiplexed from the outside, but take it apart and it becomes evident that it actually uses each antenna for a different band. It is, however, far less common than most modern routers which do take advantage of polarization domain multiplexing. On a side note, because there are only two fully orthogonal polarizations, if you have a router with 3 or more antennas, it makes sense to think in 3D when orienting the antennas, trying to make sure any device in the space of interest would get a good signal from at least two of the antennas.

[@MB-tb6jy]

NiHaoMike that's interesting. They didn't including this in my education

[@NiHaoMike64]

It's the sort of stuff IT techs learn about.

[@porko882]

Whats this have to do with light?

[@davidfrye1962]

Thanks!

[@andrewedis9907]

Get 3 of these polarised sheets and hold one vertically and the next one behind it at 45°, then a 3rd horizontal. If you love maths and physics then this should blow your mind.

[@DocAcher]

Léo's accent was just so good to listen to. I love it...

[@lowkey4890]

And cameras they too can see this magical kind of light

[@davidlederman2813]

Your enthusiasm is wonderful!! Your description of polarization is spot on too!! I enjoyed your video muchly!! A++ Physics Girl!!!

[@itzheeted3332]

3:21 when your clock is on acid

[@Sciencedoneright]

did not get it

[@TomKappeln]

Made my day ... lol

[@marcoottina654]

I laughed way too much! thanks for this underappreciated and underrated comment! :D

[@moyni89]

I wonder if being particularly sensitive to perceiving polarized light might have some relation to perceptual processing disorders like Irlen's syndrome?

[@data1.078]

@Physics Girl Your enthusiasm is ecstatic, I love it :D

[@SaberOgden]

All I can focus on was that piece of your hair sticking up at the end, thanks for a good laugh, love the science, you're awesome! ✌️😀