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The amount depends on your body size, activity level and the weather.
The review comes after a week of public outcry in response to serious allegations aired by Four Corners.
The water wars have begun.
An employee walks past storage tanks for contaminated water at the Tokyo Electric Power Co.'s Fukushima Dai-ichi nuclear power plant in Okuma last February.
The world's greatest Olympian versus a Great White predator.
Several dozen people are seen forming a human chain to rescue swimmers that got caught in a rip current off Florida's coast over the weekend.
In a potentially major milestone in the cleanup effort of Japan's Fukushima nuclear plant, an underwater robot has captured what's believed to be the first images of melted nuclear fuel inside one of...
An image released by NASA in November of the rift in the Larsen C ice shelf.
An estimated 80 people waded into the water to rescue nine others that became trapped.
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WASHINGTON — When it splits off, the Delaware-sized chunk of ice now barely clinging to one of Antarctica's largest ice shelves will become one of the most massive icebergs in recorded history,...
'There has been an increase in the amount of decay we are seeing in children.'
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This story is part of a series on ocean plastics. Artist Benjamin Von Wong is drawing attention to an ugly problem with some beautiful pictures. Von Wong's mermaid photo series, which he staged and sh...
The long-term survival of the population is now at risk.
STR New / Reuters
It's time to 'shellebrate.'
But the nation's Ministry of Energy has poured cold water on the idea.