I have not read Brian Klaas’s Fluke, the book on which the article below is based, but this line made an impression in my busy day.
The big idea: what if every little thing you do changes history?
One hundred million years ago, a shrew-like creature got infected with a retrovirus, eventually leading to the placenta and, by extension, the reason why we don’t lay eggs.
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J.R. Johnson 
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