Trace your family tree for 4 billion years - a very cool way to visualize life’s evolution. https://t.co/0ZG3r25yi9 pic.twitter.com/Rrjc1FZPke
— Chris Hadfield (@Cmdr_Hadfield) December 27, 2018
via Twitter https://twitter.com/Cmdr_Hadfield
December 28, 2018 at 04:21AM
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