A scale model of history
11:59:26 5 Mya First apes that walk erect (homonoids)
11:59:59.33 100 kya Modern humans appear
11:59:59.93 10 kya Agriculture developed
11:59:59.97 5 kya Great pyramids built
11:59:59.9987 204 ya American Revolution
11:59:59.99989 18 ya About when most of you were born.