A Cherry Tree to Mars [pdf](patrickmccray.com)39 points·by todayiamme·9년 전·1 commentspatrickmccray.comA Cherry Tree to Mars [pdf]http://www.patrickmccray.com/wp/wp-content/uploads/2013/05/sagan1976_1of8.pdf1 commentsPost comment[–]andyjohnson0·9년 전replyThe 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...
[1] http://www.patrickmccray.com/2013/04/30/cherry-trees-to-mars...