4 ms·
A Cherry Tree to Mars [pdf]
- andyjohnson0 9y agoThe 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...