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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?
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2 .People have been living near rainforests for tens of thousands of years,
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3 .but most available evidence has intense use of forest resources starting just 10,000 years ago.
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4 .So scientists thought that the dense, tropical forests were so hard to navigate and find food in that humans would have mainly depended on open plains nearby.
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5 .But some researchers had doubts.
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6 .Modern forest foragers do just fine in the rainforest.
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7 .And some evidence in Africa pointed to humans in rainforests well before the 10,000 year mark.
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8 .Now there's hard evidence, out of Sri Lanka, that people roamed and dined on rainforest offerings at least 10,000 years earlier than we'd thought.
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9 .The finding is in the journal Science.
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10 .Researchers measured carbon and oxygen isotopes in the remains of 26 humans found in the Sri Lankan rainforest.
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11 .The bodies were some 20,000 years old.
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12 .Isotope signatures differ for plants that live beneath the closed rainforest canopy than for plants from the open plains.
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13 .Any animals that eat those plants then also carry those forest isotopes,
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14 .as did the remains, showing that these humans subsisted on tropical forest vegetation.
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15 .The findings show that humans have been taking advantage of rainforests for at least 20 millennia.
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16 .Whether our accelerated resource extraction will allow any substantial rainforests to exist even one thousand years from now is a very open question.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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