From Wikimedia user Cmglee: If the history of the universe were recounted backward in a 138-page book, with 100 lines on each page and 100 letters in each line, written human history would occupy half a letter. Everything involving humans would lie on the first line; the dinosaurs would die out on the first page; and by page 10 the most complex lifeforms would be green algae.

For comparison, if the universe had begun in 4004 B.C., at this scale its history would occupy six-tenths of a letter.