published on: 2014-02-27 01:33:52
gravitationalbeauty: first sun rays in the valley, Zermatt by
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klo13.tumblr.com/post/77961583763/
thought-cafe: Col. Chris Hadfield loves Crash Course, and Crash
klo13.tumblr.com/post/77961702620/
klo13.tumblr.com/post/77961792031/