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Australian surfer saved by off-duty police officer after shark ripped off leg, doctors hope to reattach it
NASA astronauts hold their own Summer Olympics in space (video)
SpaceX's historic Polaris Dawn astronaut mission delayed until mid-August
A moon of Uranus could have a hidden ocean, James Webb Space Telescope finds
Grandmother kills college track coach in murder-suicide in wealthy New York neighborhood: police
Sun blasts out most powerful flare of current solar cycle, sends massive coronal mass ejection into space (video)

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