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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?
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2 .Some scientists say the use of fire helped make us modern humans,
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3 .it dramatically changed what and how we eat and may have even altered our anatomy.
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4 .But University of Utah anthropologist Polly Wiessner thinks that fire was also important in shaping human social interactions and cultural traditions.
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5 .Her conclusions are in the Proceedings of the National Academy of Sciences.
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6 .Wiessner evaluated day and night activities and conversations of Kalahari Bushmen from Botswana and Namibia.
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7 .These communities still live by hunting and gathering, as most humans did over evolutionary history.
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8 .During the day, nearly a third of the conversations dealt with economic issues such as hunting strategies and foraging plans.
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9 .Another third covered complaints, criticisms and gossip.
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10 .But at night around the fire, more than 80 percent of group conversations were storytelling, often about people living far away or in the spirit world.
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11 .Weissner says that humans are unique in that we create ties to others outside of our immediate group.
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12 .Gathering at the fire expanded listeners' imaginations and allowed for the development of cognitive processes that made it possible to form those links to distant communities.
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13 .Which makes fire the precursor to Facebook.
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14 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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