FREE FACT: An oblate spheroid is a special case of an ellipsoid where two of the semi-principal axes are the same size. A special thanks to our Subbable.com supporters: Robby Weisenfeld Gustav Delius Ike www.youtube.com/TheNilFacts And to Audible.com - FREE audiobook at www.audible.com/minutephysics MinutePhysics is on Google+ - bit.ly/qzEwc6 And facebook - facebook.com/minutephysics And twitter - @minutephysics 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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