Hum Hist I 11 ho 1

Hum Hist I 11 ho 1 - Human History Week 1 lecture 2 History...

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Human History Week 1, lecture 2 History of life 1/5/11 The evolution of complexity Increasingly complex structures emerge across last 13.7 billion years—from “primordial atom” at origins universe through physical, chemical, and biological structures, and now man-made structures Core question: is the history of the universe one of inevitably increasing complexity, with human history as merely most recent phase (known to us)? Or is history a matter of luck and chance? In the beginning Some key stages in increasing complexity (see Sissons for more details): Big Bang, 13.7 billion years ago (bya) Laws of physics begin to apply, about 3 minutes later Formation of stars begins, 12.7 bya; laws of chemistry begin to apply Our sun forms, 4.5 bya Earth forms, 4.5 bya Atmosphere forms, 4.4 bya Carbon-based compounds photosynthesize solar energy into proteins and reproduce, 3.8 bya; laws of biology begin to apply Stromatolites appear, 3.5 bya Simple single-celled life forms (prokaryotes) merge into complex single-celled life forms
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