Flat earth

 Here's how we can prove the earth is round. 

The first way:

We get two big wooden poles. We stick one in the ocean floor, at the coast.

We get another, and stick it into the ocean floor 20 km away. Make sure both poles are the same height above sea level. 

Drill a hole in the one at the coast. Make sure the hole points towards the other pole. 

Shine a strong laser through the hole. 

Contact a person viewing the other pole. If the laser hit the other pole at where the hole should be, we can see that the eart is indeed flat. Otherwise, if it hit above the pole or above where the hole should be, the earth is round. This drawing should show it.

This experiment has actually been done, by a group of flat earthers. 

They ended up disproving themselves. They repeated it several times. Every time it said that the earth was round.

The second way.

Look out of your front porch. Do you see the Eiffel tower? The shard? The skytower? The empire state building? Mount everest?

No? Thats because they are all hidden behind the curviture of the earth. If the earth was flat, with some good telescope eqipment, we could all see things like this. 

The third way. 

Go for a walk. A very long one. A very, very long one. If the earth was flat, when you're at the middle of the earth, everything seems normal. But as you get further to the edge, it's like walking up a skateboard ramp. Everything feels like its getting steeper, but it's just the gravity trying to pull you back into the centre.

Here are some screenshots of a pysics simulation game i used to prove this

Flat earth:

The black dots are a gravity pulling surface.

Round earth:

Notice how none of the entities are inbalanced in the round earth one, whereas in the one where the ground was flat, the ones tothe far left and right were about to fall, while the middleone noticed no difference.

Obviously, we don't feel like we're on a sloped surface if we are far from the North pole, so we can see from what we've observed here that the earth probably isn't flat.

Questions about space suits.

 1. Why is a cooling system necssary?

Because inside the space suit is a ontained atmosphere and withou a cooling system, the astronaut could overheat from his own body heat.

2. How do astronauts deal with sun in their eyes?

The visors on their spacesuits have a coating on them to protect against uv light and strong, unflitered rays from the sun. That's why you can't see the astronaut's face, usually.

The visors are made from polycarbonate plastic with a thin layer of gold. This blocks out most rays because it's so dense. Lead is also dense, but we can't use that, for obvious reasons.

3.  Why is a space suit needed in space?

I don't know, maybe: Unfiltered sunlight, uv rays, solar wind, debris flying past faster than a motorbike, extreme temerature changes from 255 degrees celsius to -145 degrees celsius, or even just the fact that there is no oxygen, or no anything really, in the void of space, so all your organs will be sucked out due to the fact that you will have air in your lungs as you exit the spaceship. You'll then become a floating corpse, drifted off into spae, getting cooked by the extreme heat of the solor rays, not filteded by the atmosphere, then deep frozen once you go into shade. Lovely.

4. Why are tools and equipmet tethered to the astronaut?

Because if they're not, they'll go drifting off into space, as there's no gravity to hold them down.

5.  What safety measures are taken to keep the astronaut safe?

Make sure they're in a space suit, make sure the space suit is functioning properly, keep them tethered to the spaceship, because theres no way to get back to it if you drift away, and most importantly, keep them focused.

Ruperts drop

 I just watched a video about the Ruperts drop - A very interesting piece of shaped glass, thats shaped like a tadpole, that is nearly indestructble on the head end. However, if you so much as chip the tail end, it will explode in to millions of pieces. 

I found out how this works however, the way it holds itself together is that when it's made, is that it gets taken out of the furnace on the stick, then the glass maker lets some of it drop in the water. As it falls, it still lets a small string of it stick to the remaining blob of glass. It hits the water. The string (Still molten) disconnects to the blob of glass on the stick. The string falls into the water. The whole thing cools. 

Now, when we take it out, it looks like this. 

The reason it dosn't shatter when hit with a hammer on the large end, is because the outside cools first when it hits the water. The inside is still hot. As the inside cools, the outside has already put itself into place. 

Now, when something heats, it expands. Likewise, when it cools, it contracts. The inside contracts as it cools. This means that it puts pressure on the outside, as to fill the space made by the contracting glass, it also has to contract. It doesn't break. It compresses. Now we have a very strong piece of glass. 

And I mean VERY strong.

https://img.huffingtonpost.com/asset/5912fb961600002000c5a684.gif?ops=scalefit_630_noupscale

However, the string is obviously very fragile, since it's long, thin, and made of a fragile material. It's still part of the framework holding together the ruperts drop, however. It's all stable, until the string breaks. 

Once it breaks, that part is unstable, as all the potential energy used to hold together the drop is now gonna be released. That part now starts losing the connections between the glass particles. Imagine it's like dominos falling. 

As one bit breaks, the bit just up it also starts "exploding". This keeps going until it reaches the major part of the droplet. Since all of it has to be pulling in, now that the end of it has broken, it can't hold itself together.

It is now a pile of shattered glass.

Rather interesting, isn't it?

https://www.youtube.com/watch?v=xe-f4gokRBs