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1 .This is Scientific American's 60-Second Science. I'm Wayt Gibbs. Got a minute?
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2 .(Mosquito buzzing sound)
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3 .Aha, got 'im!
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4 .Yes, the mosquitos are swarming this time of year.
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5 .Alaskans joke that the bloodsucker is their state bird.
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6 .But have you ever looked closely at a swarm of mating mosquitos, gnats, or midges?
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7 .It's a curious thing.
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8 .The swarm maintains a kind of shape as it moves around.
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9 .But the bugs inside it seem to flit about randomly rather than flocking like birds.
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10 .This collective, yet disordered, flight intrigued physicists in Rome.
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11 .They shot ultraslow-motion video of swarming midges.
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12 .Then they mapped the flight of each midge, and did a mathematical analysis of the collective behavior.
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13 .Their finding: the motion of the midges is not random.
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14 .The bugs stay far enough apart to avoid locking into a formation.
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15 .The swarm instead expands as needed to stay just below the threshold density.
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16 .The work appears on the site arXiv.org.
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17 .Flocks and schools move in formation only once the group reaches a critical density.
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18 .Below that threshold, the individuals move, well, like midges.
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19 .Insect avoidance of full-fledged flocking may be a reproductive strategy:
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20 .after all, it's hard to mingle when you're stuck in a line dance.
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21 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Wayt Gibbs.
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