Help support MinuteEarth - subbable.com/minuteearth MinutePhysics is on Google+ - bit.ly/qzEwc6 And facebook - facebook.com/minutephysics And twitter - @minutephysics Get a free audiobook at bit.ly/ZEAtPh Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Music by Nathaniel Schroeder www.soundcloud.com/drschroeder Thanks to Nima Doroud for contributions.

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