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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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Comparisons of different animals have shown that larger brains provide greater intelligence,
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but they also guzzle more energy and have other consequences.
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Now scientists have observed the effects of varying brain size within a single species: guppies.
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The work is in Current Biology.
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Swedish researchers bred two different lines of guppies, selecting one for larger brains and one for smaller.
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The fish quickly modified until brains were nine percent larger in the big-brained line than in the other.
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Not surprisingly, when 48 guppies were given learning tests, large-brained female fish outperformed small-brained females.
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However, males from both lines scored about the same, possibly because the female guppies' visual system was more suited to the type of intelligence test used.
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But big brains also had a downside--the brainier fish had smaller guts, by 20 percent for males and 8 percent for females.
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Plus, the large-brained guppies produced 19 percent fewer offspring.
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In order to provide energy to their bigger brains, the egghead fish made sacrifices that may be evolutionary disadvantages.
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It may indeed be possible to be too smart for your own good.
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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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显示原文 =This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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显示原文 =Comparisons of different animals have shown that larger brains provide greater intelligence,
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显示原文 =but they also guzzle more energy and have other consequences.
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显示原文 =Now scientists have observed the effects of varying brain size within a single species: guppies.
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显示原文 =The work is in Current Biology.
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显示原文 =Swedish researchers bred two different lines of guppies, selecting one for larger brains and one for smaller.
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显示原文 =The fish quickly modified until brains were nine percent larger in the big-brained line than in the other.
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显示原文 =Not surprisingly, when 48 guppies were given learning tests, large-brained female fish outperformed small-brained females.
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9 / 14
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显示原文 =However, males from both lines scored about the same, possibly because the female guppies' visual system was more suited to the type of intelligence test used.
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10 / 14
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显示原文 =But big brains also had a downside--the brainier fish had smaller guts, by 20 percent for males and 8 percent for females.
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11 / 14
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显示原文 =Plus, the large-brained guppies produced 19 percent fewer offspring.
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显示原文 =In order to provide energy to their bigger brains, the egghead fish made sacrifices that may be evolutionary disadvantages.
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13 / 14
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显示原文 =It may indeed be possible to be too smart for your own good.
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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- 单句循环：关
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