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Genetics used to gauge whale comeback
North Atlantic humpback whales have recovered from years of whaling, but a precise pre-whaling number estimate is key to defining that recovery, scientists say. ... more
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Senators propose first US carbon tax
US senators proposed a tax on carbon emissions Thursday amid growing calls for action on climate change, but the bill is expected to face strong opposition from conservatives. ... more
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Tiny mutation had big evolutionary impact
A small genetic mutation 30,000 years ago spread rapidly in central China and may have helped humans in Asia survive severe heat and humidity, researchers say. ... more
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US slams 'horrific' toll of Tibet self-immolations
The United States on Friday denounced the "horrific" toll as the number of Tibetans who have set themselves on fire to protest Chinese rule rose to 101. ... more
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