Dope Tech Episode 2

<<@MinutePhysics says : Sign up to get started with Brilliant for free here: https://brilliant.org/minutephysics. You'll also save 20% off an annual subscription.>> <<@sunglassesemoji2870 says : I can sense people watching me, but my therapist says I'm experiencing psychosis weirdly enough I'll prove him wrong with this one I'm sure of it>> <<@Alexis.Brooke says : I read about an experiment where people were given glasses containing mirrors that flipped their image of the world upside-down. After several hours, the brain was able to compensate for this, and the image appeared right-side-up again. Then, after removing the glasses, their vision remained upside-down again for several hours until the brain flipped the world back again. I've always wanted to try this for myself.>> <<@TheXerxesCanal says : 2:45 IM HIMEJOSHING OUT>> <<@spookykitty2327 says : 12:07 those objects *are* different colors. You just didn't remove the shadow>> <<@KarlRKaiser says : Any attractive woman can answer this in the affirmative. You don't need a physicist and it doesn't matter if they can't explain it. Attention is a form of subtle energy, and it goes in the direction of the viewer. That's why we use the word "creep" to describe men who oogle women, because that subtle energy is of the same ethereal substance as ghostly spirits.>> <<@tislex says : I knew that voice was familiar>> <<@NXTangl says : The gorgons of the Laundry need to spooky-action-correlate two cameras to transmute carbon into silicon.>> <<@patotrentacoste says : you didnt answer the question.... so disappointing>> <<@ikciii says : Balor's evil ancient tithe: 5% flat income tax>> <<@Kaikaku says : Maybe my eyes soon sense a third video title? 1. We Used To Think Light Came From Our Eyes 2. Can You Sense Someone Watching You?>> <<@HasanAli-kd2vx says : How veritasium got younger? An old video?>> <<@carltonleboss says : Very cool.>> <<@StudioJLP1 says : You didn’t live up to the title. Please remedy.>> <<@cambraca says : After the sixth cloth, a lot of value was created for shareholders.>> <<@FW2F says : What science narrators usually overlook that an uncountable number of people may gave theorized sight as receiving and collecting light. Just because the records point to ibn al haythan does not provide that others were before him, leaving no records behind>> <<@4-0-4-Nobody says : Title: Can You Sense Someone Watching You? "The philosopher Plato suggested that sight was visual fire that melded with daylight" So... *no*>> <<@-1f says : And at last I see the light~ 🔥>> <<@05degrees says : The upside down problem _per se_ is, of course, not a problem at all because the brain doesn't know where the "up" is in what the eye sends to it _supposed to be._ It just learns, probably the usual way it learns most other stuff, where's up and where's down, and maybe it does that conclusively only when the it learns how to sit upright for extended amounts of time (and then how to walk and stand). After all, we do already know the brain of an adult re-learns directions if given stable and coherent picture turned upside down for some days or weeks, and I daresay to predict there may as well be enough plasticity to learn how to see more or less functionally if each eye's image is rotated in different and arbitrary angles, just of course unchanging during the experiment. And what I mean by this addition is, there should be no _special_ and _fixed_ circuitry to rotate in any specific way. And anyway even in those experiments, it's very likely the brain is not rotating anything in naive geometric sense (every point transforms into another point) anyway. Designating where there's up, down, left and right in the brain would be more economical without rerouting or recomputing everything incoming, even on the later stages where there's fewer processing of higher-level vision primitives. The brain probably just remaps a couple of directions and leaves most of the visual processing as it was. Again, a thought experiment: let's take the retina of an eye and rotate it 180° (twisting the optic nerve but that's irrelevant because we can connect it in this way without twisting either). What exactly changed? Almost nothing. (I'm strongly sure that cellular structure of the retina doesn't have any preferred directions.) So the brain itself doesn't have to do any rotation per se, it already receives information in a way orderly enough we can distinguish different parts of the image a singular eye sees, and it's enough to _set_ up and down, per necessity of living in a uniform gravitational field and having lots of separate evolutionary predispositions that clue the brain in that it's how it's supposed to model space. Now, if there's really an immutable tool in the brain that rotates what got sent... that's a question for evolutionary biology! Why is this? It isn't needed at all! And if it is, the question becomes way more interesting that our naive confusion of where the up "should" be.>> <<@evilmurlock says : The brain doesn't really flip the image right? Its not doing rotational transformations. It simply plugs the TOP neurons to the bottom part of the retina, and the BOTTOM neurons to the upper part the the retina. I am pretty sure I am right! And I hate how people say the brain flips the image! IT doesn't! It just interprets the data correctly in the first place.>> <<@CanusDirusx says : Awesome video.>> <<@OnyxSkiesXIX says : Thought I was getting a MinutePhysics video, instead had to suffer through Veratasium being on my screen>> <<@gaston7261 says : Third eye like Shiva, damn>> <<@unicornathon says : I did not enjoy this and I continue to not enjoy Derek Muller post-acquisition.>> <<@EskoLuontola says : 10:30 "...was making light of this matter" 🥁>> <<@christosvoskresye says : Oh yeah? Then how do you explain Superman's x-ray vision, when there are rarely any ambient x-rays in the real world? And that's to say nothing of his heat vision.>> <<@FourthRoot says : Animals' eyes don't gleam at night unless they are illuminated by a light source close to the camera or observer's eye. I suppose this effect might be noticed dy a person looking out a window or maybe very occasionally if the animal is sitting near the shaddow of the observer's head by the sun or moon. Prior to the invention of the acetylene headlamp, I doubt hardly anyone had witnessed glowing animal eyes.>> <<@nextorniquete says : Hears Derek. Instant turn off.>> <<@SkyIsVoid says : derek?>> <<@nickyonge says : 2:13 May chaos take the world!!!>> <<@warp.routine says : Hear me out... From birth, you have image data flowing into your brain from the retina. Your experience of up and down is based on that. The image is not upside down, it's just image data that your brain processes into sight. You apply up and down based on experience, not intrinsically. Just like forward is always ahead but it is not always north. Different things.>> <<@KnowArt says : lovely video!>> <<@The_Jzoli says : 14-minute physics>> <<@xTerminatorAndy says : spends 15 minutes blabbering about all kinds of eye stuff but never once answers the question from the tit le>> <<@RealCadde says : "Why doesn't our eyes see the world upside down" EASY! The eyes are upside down! Thus the image we see is right side up! On a more serious note, we are just wired that way. Our brains process the signals from the optical nerve and in that processing we make what we see right side up. Our eyes are just part of a neural network, it doesn't "see" the image that is projected in our eyeballs. It is basically a "light thought" that is being transmitted to our visual center who sees the world right side up. Or rather, in relation to the orientation of our eyes. It's like asking, if all cameras get an image "upside down" then why are all images I see always "right side up"? Because processing.>> <<@rishabhgopal7142 says : OMG IT'S LITERALLY MY THREE FAVOURITE YOUTUBE CHANNELS COLLABORATING I AM SO EXCITED LFFGGGGGGG>> <<@GreatGreatFood says : vertasium jumpscare>> <<@Jon-t6c says : 11:46 ....😮 Oh no... I've seen that a few times. It's probably not good. I've also seen the flash you get if you bang your head bad. And I've also seen a neutrino hit my optic nerve and my whole head lit up... I was in bed in the dark and silence, it was mega weird to say the least... Erm ... cosmic rays, muons, high energy particles.... something like that. Like astronauts eye, Google it>> <<@mikithekynd says : Nice to know that even back in the days Veritasium was making videos that don't relate to their title. Seriously, the title made me think of how we as animals have learned how to spot pupils of eyes, even in the far corners of our vision cone, and how our nature pushes us to match the eye contact with the perceived eye. Or how sometimes you can genuinely "feel" someone is watching you, even when they're behind you, but that's most often our brain guessing what the other person (most often someone we're having a conversation with) is doing. The title completely doesn't fit the content.>> <<@Mnnvint says : If you think this is obvious, look up Dual Photography, which uses clever mathematics to switch the role of a light source and a camera in a scene! You could use it to look around corners... except that the things the light source could see on the other side of the corner, won't be visible since the camera-now-light wouldn't be illuminating it!>> <<@Walabio says : The idea that eyes shoot ligntrays is just silly. As for inverted image, to the brain, the image is the image. Worrying about how the brain flips the image is just silly. Waymos do nopt flip the image bause the image from the camera is simply the image to the robot. Worrying about flipping the image is just stupid.>> <<@AliAbdolmanafi says : Well guys we're officially 8 years late>> <<@Lardah says : I know someone convinced by people knowing when they're being loved at. I said people sometimes just look around and they notice if someone is starting at them 😂>> <<@Joel2Million says : Rename the channel to 14minutephysics 😅>> <<@Jobobn1998 says : Fam, the fact that the Islamic Golden Age ended due to the rise of the Mongolian Empire is the such an amazing through-line this video sent me down. I totally did not know about that connection!>> <<@RealCadde says : "Animals eyes seem to gleam at night" Only if there is a light source in the direction they are looking. I find it pretty hard to believe there be many light sources in ancient times. Only during moonlit nights could you get that "catseyes" effect that most animals get when you take pictures of them. A deer in headlights will also of course appear to have glowing eyes.>> <<@Locke99GS says : Nobody survived to say what happened after Balor uncovered the 6th cloth. The 7th we can infer is the logical conclusion and what is known by those who came and saw the aftermath.>> <<@mvsh says : When Veritasium was still good>> <<@manamesjay says : Wow>> <<@Jon-t6c says : 3:52 I think it's intuitive and easy to think this.... Shiny spherical objects contain a gleam, that is the incoming light, reflected off the object and into our eye, and when we move the object around in a room at night with a torch, the gleam moves to point at the light, as the path it took to your eye.... Which explains that. Then when you move the object behind you, so your body is blocking the light or behind another object, the gleam disappears and the object becomes dark. Also, moving the object into the dark, it disappears. But moving our eye into the dark, when the light and object are lit, shows that we can still see it. Proving that light is emitted, reflected then detected into our eyes. Explaining the whole phenomenon This is very simply correct use of scale augmentation. Because you are scaling down and forming a representation of the sun, moon and earth at local scale you can observe. Explaining that, just like light comes from the torch, to the object and then eye and we see it, ... Light comes from the sun, hits earth and is reflected back into our eye, and that's why at night it's dark. Also.... observing a large droplet of water, you see that it both reflects bright light, and when you look close, you see a small "holographic" or mirrored micro image of what's behind... And this illustrates that this is how the eye works, ....the liquid in the eye, can both magnify and reflect light, while also being spherical in nature, it is also capturing a microscopic copy of the image it contains because of a similar property to a prism but spherical. ......in that a prism has the ability to concentrate light to a point, almost compressing it, then reflecting it in a wider band. The spherical nature of the eye takes a large cone of light and sort of reflects the whole thing at small scale, and out of our eye.... And we are inside the centre of this almost parabolic mirror watching the back of that reflection.>>