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when toggle format what by license comment
May 25, 2013 at 11:08 answer added escargot agile timeline score: 1
May 25, 2013 at 7:56 comment added user114 The "Dialogue Concerning the Two Chief World Systems"was a 1632 book by Galileo Galilei comparing the Copernican system with the traditional Ptolemaic system.
May 25, 2013 at 4:08 review First posts
May 25, 2013 at 5:04
May 25, 2013 at 3:50 history asked mikemelon CC BY-SA 3.0