How old is the Earth, how long did it take for life to appear, and how long would it take for your hair to grow to the Moon? Find out in this video from MinuteEarth (a new project by MinutePhysics’ Henry Reich):
(Because you always wanted to know how long it would take for your hair to grow to the Moon — admit it.)
And be sure to check out MinuteEarth’s newest video Why Are Leaves Green? Part 1 and Part 2.