Backup diff of 2013-02-16 (No. 1)

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  • 1 (2013-02-16 (Sat) 15:35:18)
  • 2 (2013-02-16 (Sat) 16:43:19)
  • 3 (2013-02-16 (Sat) 23:47:44)

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- 天体衝突とはどのような災害か
--  http://d.hatena.ne.jp/active_galactic/20130216/1360980178