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Acrid smoke continues to pollute skies in the western United States. On some recent days, the air quality in Portland, Seattle, San Francisco and ...
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A fearsome [disease] has been recognized in recent years, produced by a one-cell organism…. Mercifully, human invasion is rare, for the invader, a...
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Footprints discovered at what was once a rain-fed lake in Saudi Arabia’s Nefud Desert suggest that humans on the move made a pit stop there more t...
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