Can heat from friction stick a pencil to the wall? (2 Truths & Trash)

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Here's a list of questions that will be answered in this video:
1. Can you stick random objects to walls just by sliding them?
2. Does sunscreen block IR waves?
3. Does water with food dye propagate through paper towels and create new colors in empty bowls?
4. Can you extract iron from cereal?
5. Does magnifying the sun on the black part of a balloon make to easier to pop than on a lighter colored part of the balloon?
6. Does a toilet flush in different directions depending on which hemisphere you are in?
7. Does dropping a heavy object off of a boat cause the water level to rise?
8. Does adding water inside a balloon prevent it from getting popped by a candle flame?
9. Can you instantly freeze ice by chilling purified water in a salt water and ice mixture?
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Oh, it lowers? I thought it was a technicality of “if the cube is in the boat, and the boat is in the water, both the cube and the boat are in the water. Moving the cube wont displace it, because it was _already displacing it”_

crep
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as part of the 11% of the world's population who lives in the southern hemisphere, my toilet flush doesn't even spin it just goes from all directions

salxrn
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For the dropping objects from a boat video, there is a simple way to understand this. Image you have an ultra-dense object, denser and smaller than anything you can possibly get on earth. If you took this onto a boat, it would make the boat sink very low into the water. Now, throw this ultra-dense object overboard. The boat rises up a bunch because of the loss of weight in the boat. But, the volume of that ultra-dense object isn’t the same as the boat. Thus, the amount of water displaced is LESS then when the object was on the boat, so the water level drops.

Now, another riddle that is somewhat related:
If instead of an ultra-dense object, you had a bowling ball, would throwing it overboard cause the water level to go up or down?

mcb
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We used this method of sticking stuff to the wall with plastic pens to troll our friends in school.
You take a few pens and hold them together so that one pen in the middle sticks out the bottom. Then you hold them tightly together and slam them onto the desk so the one sticking out gets pushed into the other group really fast. The resulting friction causes the plastic to get hot and sticky, so the pens fuse together.
In some cases you actually had to break them to separate them.

I thought the video was fake because pencils usually don't work with this, probably because their paint coat doesn't melt. Maybe yours are different though.

kamataros
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In reality water spin direction does depend on hemisphere but it has very little impact compred to other things influencing diflrection

ojgfhuebsrnvn
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I got the 3 right but i watched the boat video before so that might have helped

FauconParodie
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2:12 tornadoes also spin counterclockwise in the northern hemisphere but clockwise in the southern hemisphere aswell. This is called the corilis effect (I completely butchered that, sorry), and it is caused by the earths rotation. Whenever wind enters the Southern Hemisphere from the northern hemisphere, the wind sort of “bends” because of wind resistance.

CertifiedMadman
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every video you make, I always learn something new and am amazed. it really is jaw dropping science!

pixelpuppy
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1:00 yeah i knew this one was real because in my science class there was a part of the wall that was just a bunch of pencils 😭 the teacher had to shut us down and I think we got a mini lesson because of it though

birdlovesart
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First one isn’t fair, my walls aren’t cardboard

Spotzisfun
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You can also stick random objects to the ceiling, which I once did with the blackboard duster at school. The teacher had to go get a replacement. Then, part way through the lesson, the one on the ceiling fell off, and landed slap on the desk right in front of them. There was much childish hilarity and the teacher was totally bemused.

stuartmcconnachie
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Dude the first one took me BACK. I remember when that meta first dropped back in middle school and people would just start putting pencils on walls because they could. Good times

Faloser
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*sees objects stuck to the wall*: There's no way this is true...
*sees "sunscreen" blocks IR and not UV*: Nope, this is the false one, nevermind.

bonevelous
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For anyone that is still wondering if the pencil thing is real, it is. I did it on accident at school

ImAFatSlobSo
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I just thought back to school where they told us the mass of water displaced by a buoyant mass is equal to the mass of the object, whereas if that mass was removed from the boat it would displace less water than when it was on the boat, since it would displace it's volume instead, which is far lesser a volume of water being displaced.

superpancake
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Here's how you make the dense object off a boat make sense.
Let's say you're in a boat and you're going to take something from the water and place it into your boat.
One object is 1 cubic foot and weights 10 pounds (not so dense)
The other object is 1 cubic inch and weight 10 pounds (super dense)
Each object will weigh your boat down the same amount, displacing the same amount of water while inside your boat
However, clearly the less dense objects displaces much more water when it's outside the boat.
If your boat is like a weight pushing down on the water causing it to displace, adding anything with a density greater than water to your boat will cause a greater displacement than its own volume.

goseigentwitch
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2:35 - 2:42: I knew it was fake, because I am in the northern hemisphere, but the toilet rotates clockwise.

Bus-
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Round 3:
1: that's a tricky one, but no. in the boat, the water displaced weighs as much as the cube (+ the boat, but let's ignore that one for now).
Because the cube sinks to the bottom, the water displaced by the volume of the cube HAS to be lighter than the cube itself

ichbrauchmehrkaffee
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the coriolis effect can affect water if the bowl is big enough.

Kingstallington
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The third round was such a freebie because you basically just showed us that they’re possible

weirdhungidas