Why Are Planets Round?

Why do more eggs means less water in an egg boiler? Does a hip replacement shorten a leg? Where do beetles go in winter? And why are planets round?...
04 November 2011
Presented by Chris Smith, Redi Tlhabi

Saturn-cassini-March-27-2004.jpg

Saturn and its rings completely fill the field of view of Cassini's narrow-angle camera in this natural-color image taken on March 27, 2004.

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Why do more eggs means less water in an egg boiler? Does a hip replacement shorten a leg? Where do beetles go in winter? And why are planets round? Plus, how killing off aged cells improves vitality, why pollution is intensifying cyclones and how skin cells can see UV...

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