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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .The human voice is capable of forming a plethora of incredibly different sounds.
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3 .So many, in fact, that each individual language contains only a subset of potential sound units, or phonemes.
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4 .What factors determine whether a phoneme enters common use, or is relegated to silence?
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5 .It turns out, geography may play a role.
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6 .One phoneme that occurs in only about 20 percent of the world's languages is the ejective consonant, such as p' or k'.
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7 .Caleb Everett, an anthropologist at the University of Miami, decided to map where this sound occurs.
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8 .He took a sample of 567 languages spoken around the world, and compared the locations and altitudes of those that either contained or ignored ejective consonants.
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9 .Everett discovered that languages that included ejective consonants were generally spoken at a higher elevation than those that did not.
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10 .His research is in the journal PLOS ONE.
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11 .Everett suggests that the sounds are more popular at altitude because lower air pressure may make it easier to produce the burst of air that is a key characteristic of ejective consonants.
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12 .Which is P-retty C-ool.
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13 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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