Thanks to Volkswagen for supporting this video - vwoa.us/160kehn And check out Aatish Bhatia's excellent physics blog - www.empiricalzeal.com/ Volkswagen would like you to know that every new Volkswagen comes with no-charge scheduled maintenance for the first two years or 24,000 miles. For more on time-travel, here are some works by physicist and time-lord Sean Carroll: Rules for time-travellers - blogs.discovermagazine.com/cosmicvariance/2009/05/14/rules-for-time-travelers/#.UmQ5QBYz5Hw Learn more about time and time-machines in his book From Eternity to Here - preposterousuniverse.com/eternitytohere/ Visualizations of the spinning universe - iopscience.iop.org/1367-2630/15/1/013063/media An engaging talk on the Paradoxes of Time Travel - vimeo.com/11917849 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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