http://en.wikipedia.org/wiki/Ren%C3%A9_Descartes http://www.philosophypages.com/ph/desc.htm_ Discourse on the Method by Rene Descartes - Track 1 http://www.youtube.com/watch?v=ZwBW-wPgWS4

TOKYO_SUNRISE-05:30 SUNSET-18:01 MOON-26.3DAYS_ Miracle Above Manhattan http://ngm.nationalgeographic.com/2011/04/ny-high-line/cook-photography教育基本法・学校教育法公布の日, 財政年度末, 普通選挙法成立日, オーケストラの日, 復活祭（イースタ…