3 ms·
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/ http://www.patric
by andyjohnson0 10y 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/ http://www.patrickmccray.com/2013/04/30/cherry-trees-to-mars...