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Sydney switches off for Earth Hour

Sydney's Opera House and Harbour Bridge plunged into darkness Saturday for the Earth Hour environmental campaign, among the first landmarks around the world to dim their lights for the event.

Mar 29, 2014 2.2 / 5 (5) 3

A wet Moon

The Moon's status as a "dry" rock in space has long been questioned. Competing theories abound as to the source of the H20 in the lunar soil, including delivery of water to the Moon by comets.

Mar 26, 2014 5 / 5 (6) 1