Schrödinger's Cat
Schrödinger's Cat is a very famous Quantum Physics puzzle created by, obviously, Erwin Schrödinger. It has no true answer, and scientists have puzzled over it for centuries. A very basic breakdown of this experiment goes as follows: Say you have a barrel of gunpowder (or poisonous gas), and it has a 50/50 chance of exploding. Say you decide to place that barrel into a bunker. You cannot hear or see inside the bunker, so you do not know if the barrel will blow up or not. Now, if you place a cat into the bunker with the barrel, it gets more complicated. Once you close the bunker, you have no idea what is going on inside. All you know is that the cat has a 50/50 chance of living or dying. If the barrel explodes, the poor kitty dies. If it doesn't, then the kitty stays alive. So when you open the bunker, the cat will be alive or dead. But, according to Erwin Schrödinger and Quantum Physics, the cat is neither alive nor dead while it is in the closed bunker. It is in a supernatural state, until you open the bunker. Using this logic, Schrödinger decided that by opening the bunker, you are forcing a decision, for something to happen. He essentially believed that before you opened the bunker, it was as stated before, dead and alive. But once you opened it, it was you, by opening the bunker that forced nature to make a decision, to have the cat dead or alive. You are basically killing the cat or keeping it alive. A more thorough breakdown can be found by watching the YouTube video below.