SMBC Physics: Why are stones round? feat. Zach Weiner

Zach Weiner of SMBC comics is guest illustrator on MinutePhysics! http://www.smbc-comics.com Why are some stones round and others flat? Tweet it - http://bit.ly/xNraRa Facebook it - http://on.fb.me/xCCsrl minutephysics is now on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter

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