[–] andyjohnson0 9y ago ↗ The blog post [1] that links to the PDF gives some context to Sagan's talk.[1] http://www.patrickmccray.com/2013/04/30/cherry-trees-to-mars...
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[ 3.0 ms ] story [ 4.0 ms ] thread[1] http://www.patrickmccray.com/2013/04/30/cherry-trees-to-mars...