The value of the number of the numbers between 0 and 1. When you learn that there's an infinite number of numbers between 0 and one that contain no number higher than one, meaning that you can have inifnite possibilities that nevertheless do not contain every possibility, it changes your outlook on life.
My dad just added a great one to this- and it’s very engineer-brained:
There is an infinite number of points between here and there, but you can still walk from here to there. Infinite points in a finite distance.
