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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Practice makes perfect.

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And that may be especially true for the security agents who screen your luggage,

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because a new study finds that transportation security officers become better at detecting threatening items when they appear more frequently.

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Remaining on the lookout for hidden weapons can be mentally exhausting, particularly when the items in question are so rarely seen.

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That fatigue could translate into missing something deadly when it finally does show up.

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So researchers put some newly trained security officers to the test.

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They asked the agents to eyeball the x-rays of five sets of bags and call out if they saw any guns, knives or bombs.

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In the first three sets and in the last one the banned objects were few and far between.

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But the fourth set was a jackpot.

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Turned out that the agents were better at spotting danger when there was more danger to spot.

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And this eagle-eye acuity carried over to when the threat level once again dropped.

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The findings can be seen in the Journal of Vision.

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The results suggest that airport security might be beefed up by letting agents spot a simulated stockpile of arms before they scan for the rare real things.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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