All human history happens in the last 15 seconds of the cosmic calendar.
Neil DeGrasse Tyson (via mrserialx)
Really? Back of an envelope calculation:
Calendar = 12months => Universe time = 13.8 billion yrs
1month => about 1 1/8 billion years
1 day => 3/80 billion years = about 35 million years
1 hour => about 1.5 million years
1 minute => 25,000 years
15 seconds => about 6500 years.
… and ancient Mesopotamian cuneiform script dates back to around 3500 BC… so pretty damn good. I guess where you start the human history clock is much of a muchness, but this analogy seems good to a couple of seconds. How about that :)
Each second comes out to about 433 years, give or take maybe a decade in rounding errors.