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Monuments, Countries Douse Lights for 'Earth Hour' It was lights out in about 170 countries on Saturday as millions of people and thousands of cities took part in Earth Hour, a global effort to draw attention to climate change.
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Impact crater linked to Martian tsunamis Scientists have located an impact crater linked to powerful tsunamis that swept across part of ancient Mars. The team believe an asteroid triggered 150m-high waves when it plunged into an ocean thought to have existed on northern Mars three billion ...
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