Also, thinking about cosmic and cataclysmic events helps remind me that it's not all about me:
The current theory that accounts for all the evidence is that a Mars-size asteroid hit the Earth over four billion years ago. The mélange of Earth’s crust and asteroid debris ejected into space, ultimately congealing as the moon and tilting the primordial Earth.
With that great cataclysm came our seasons, months and the duration of days. Our internal timepieces, and some of the maladies we suffer, lie as artifacts of this moment in our planet’s history.via NYTimes
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