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Did you know…

24 Aug

… that 3.5 billion years ago, on an ancient version of Earth, a day was only about 15 hours long? Dr. Linden (again, The Accidental Mind) suggests that bacteria living during this period developed the same type of inner “circadian clock” that humans do today in our sleep/awake cycles.

This chart displays the continuing general trend towards a slowing rotational period over the last 50 years: