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December 21st, 2013

On the first day of winter, the tilt of the earth means that the sun directly illuminates the latitude 23.5 degrees south, so less radiation reaches the northern hemisphere - the north pole is in total darkness.

December 21: the first day of winter - the shortest day of the year

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Rick Mastrazio on a spacewalk on mission STS-118. Photo: NASA

The leaking space suit has been repaired in preparation for an operation of three space walks in the coming week - the first of which is today

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Obesity. Photo: shutterstock

Why do we get fat? / Gerry Taubes

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