[00:02] part of the universe and brought these two uncharged mirrors very closely happen. I mean, there's no air repelling magnetic forces. Okay, there is a tiny amount of gravitational attraction, but
[00:16] it's so small that we can ignore it. But if you push them close enough, then suddenly they snap together. To understand why, let's look at these ships. In rough seas, big waves crash against them from
[00:28] physically can't fit in the tiny gap between them. And if the left ship blocks waves from the left and the right ship blocks waves from the right, then from the left, and the right ship experiences waves only from the right,
[00:42] which pushes them together. And it turns out that empty space is just like the ocean. It's filled with quantum waves with all kinds of sizes. And when the plates get really close, the big waves are blocked from the gap, creating a
[00:54] massive pressure difference that crushes them together. It's called the Casimir effect, and it is strong. At a gap of just 10 nanometers, that pressure is one atmosphere. So, for a plate of this size, that creates a crushing force of
[01:07] 103 kilograms. That's a large adult human standing on a coaster created by human standing on a coaster created by nothing but empty space.