Everybody knows that we need blood in order to survive. It flows around our body via an intricate road map of blood vessels that looks rather impressive when you see it drawn on a medical diagram.

But then, do you know how far your blood vessels would stretch if they were all laid out end to end?

Rather surprisingly, they would stretch for a total of 60,000 miles, which means they would wrap around the earth—twice! Clearly, this is only possible because of the small size of the vessels in your body, or else we would all be a crazy size, but it is just another example of how amazing the body is.