"The most instructive way I know to express this cosmic chronology is to imagine the 15-billion year lifetime of the universe compressed into the span of a single year...It is disconcerting to find that in such a cosmic year the Earth does not condense out of interstellar matter until early September; dinosaurs emerge on Christmas Eve; flowers arise on December 28th; and men and women originate at 10:30 PM on New Year's Eve. All of recorded history occupies the last ten seconds of December 31; and the time from the waning of the Middle Ages to the present occupies little more than one second. - Carl Sagan, The Dragons of Eden
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