I Tested EVERY Mark Rober Video!

Today I'm testing out every Mark Grover YouTube video. If you don't know who Mark Grover is, he's a YouTuber with 80 million subscribers that does a variety of things on his channel like testing out science experiments and so much more. And in this video I'm going to be testing to see if his videos are actually truthful or if he just does it to get views. This is going to be really interesting. How can you balance a quarter on the edge of a dollar bill? And here's what I mean by that. If you have a dollar bill, can you put this quarter right here and balance it on this edge? Now you might be thinking, oh yeah, you just fold it over like that, but that's cheating. I'm actually talking on a straight edge, this $20 bill. So you start by placing the quarter right here, sort of in the cheating method. Then if you slowly unfold the dollar bill, there's a little trick of friction. And then when you lift it off the table, it's perfectly balanced on the straight edge of a dollar bill. How freaking cool is that? So I took a $1 bill because that's all I have because I'm poor and I took a coin and I did exactly as the video said. Now what I didn't include is that if every Mark Robert video I test today is truthful, then I have to do whatever the top comment says to my cat. This should be really interesting. Got a fun one. That's pretty simple. You just take a very clean plate and just put a nice little layer of water. Have you ever seen those water spiders that like glide on top of the water? The question is like, why does it float on the water? Why doesn't it just sink? We're going to demonstrate that a little bit while I just pour a lot of pepper. It's on the surface. It's like one of those water spiders. Okay. Then you just take a little bit of this blue stuff. We like to call dish soap, but a wee bit of it on your finger, like so put it wherever you want. I'm going to go right in the center. I'm a magician. I am a powerful wizard. You're a wizard, Bobby. I don't know what Mark Robert was on when he was making that video, but I took the dish soap. I put it on my hand and now this was the big moment of truth. And as you can see, it kind of worked. Say you take cylinder of water like this, and then I take some arrows here. And now when I put those two arrows behind here, now they're pointing that way. So it's actually flipping the image and believe it or not, your eyeball does the same thing. When you look at an image like this, because of the way the light bends in this lens, it actually flips it upside down. Now you might be thinking, well, hold on a second, Mark. That doesn't make sense because I'm looking at you and you're right side up, but guess what? Your brain is flipping that. When you are born, you immediately see everything upside down and your brain pretty quickly figures out the trick of flipping it over. So I drew two arrows on a piece of paper, and now we're going to see if this actually works. This is one I'm really excited for. So I took it over to a picture of water and after I put it behind the picture, it really didn't work. But since it wasn't a perfect cylinder, I got another cylinder and now we're going to see if this works. Oh my gosh, that actually works. And with that video also being truthful, we're now three out of three on Mark Rober videos being truthful. How does my friend Science Bob pass this metal ring straight through his finger? What the heck was that? So this is a trick that uses persistence of vision. Persistence of vision relies on the fact that your eyes can only send a limited number of visual pictures to the brain each second because the pinky bend happens so fast. There's a good chance your eyes never sent that part of the trick to your brain, which means your brain has to assume the ring just went through your finger, even though it knows that's really not possible. And that's how you can pull off this mind-blowing trick like I do. Huh? Huh? After maybe a bit more practice. Oh, dang it. Stop laughing. As I guess Mark Rober's feeling a little frisky when he made these videos. But anyways, I'm trying to figure out how to put my finger and make it look like it's going through the ring. After a bit of practice, I still wasn't getting it down, so I decided I'd try it on my cat anyways. Now, I didn't have a ring, so I took a key chain and it actually looked pretty similar. And now we're going to see if we can do it in front of my cat. But my cat was not impressed and neither was I because I wasn't really doing it correctly. And I realized it's probably going to take a lot more practice to make it look perfect and it's not going to take just one minute. Guess how many drops of water could fit on top of this penny? 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. The surface of that penny is fully covered. We can keep going with 12, 13, 14, 15, 16, 17, 18. And this is surface tension in action because they're kind of linked up on that surface, which creates an extra sort of binding surface just on the top skin. I'm at 22 now. Let's see if I can sneak any more in. 23, 24, 25, 26, 27. Ah, we got to 28. That's pretty good. All right, guys, this one I'm really looking forward to and we're going to see if this actually works. Now, I didn't have a little water dropper, so I used a little straw and then this happened. Now, this was generally one of the most insane things I'd ever seen as the water was almost holding onto the other water, making a dome. Can you fully submerge your hand in water and not get it wet? For that, we need to refer to a concept called hydrophobia. Now, before I show you my version of hydrophobia, I want to show you one that you can just do yourself at home. So, this is just a glass of milk and right here, I've got some delicious cocoa powder. I'm going to take it on my spoon and watch real carefully. I'm just going to dip it in the milk, fully covered, bring it up. Oh, it looks all milky, right? The cocoa powder is hydrophobic. It's like afraid of water. Isn't that so fun? It looks like it's covered in milk, but then when you actually pull it up, it's like a skin that just peels away. To put your hand in water, use a little something called lycopodium powder and if I put a nice little layer on top of the water like this and then take my fingers, put them in very slowly, they come bone dry. I want to see if I can go even deeper by bringing in this huge dish. The moment of truth. Wow, cool, totally dry. Alright guys, we're currently five for five in these videos being truthful. So, if this last video is truthful, then I have to do what the top comment says to my cat. So, I took a spoonful of cocoa powder and we're going to see if it works. Now, come to think of it, whenever I used to make myself hot cocoa, the cocoa mix would always stay at the top of the glass and have trouble mixing with the milk. So, I'd be surprised if this doesn't work. However, after I took it out, the milk really didn't come unstuck out of the cocoa powder, so it's technically not really truthful. Now, since my cat won't be having to do a top comment on the video, I decided I'd give him a consolation prize and give him a bunch of treats and I gave my other cat one too so he wouldn't be jealous. And yeah, that's what happens whenever you try every margrove or short. They're pretty truthful and you should go try them out yourself. As for this video, be sure to comment what you think, like the video, subscribe, and check out all my other videos. Thanks for watching and I'll see you in the next video.