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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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Ever throw an avocado in a paper bag with a banana to get the avocado to ripen faster?

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That trick works because both of them are what's called "climacteric" fruits.

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Meaning they release ethylene gas as they mature¡ªand the gas in turn accelerates ripening.

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At maximum ethylene release, the fruit reaches peak ripeness: ideal taste and texture.

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After that, the fruit's cells begin to die, molds move in, and it rots.

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So how to determine the best time for picking and eating?

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Today's high-tech farmers might sample the ethylene released by the fruit, as it sits in an airtight container.

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Or use a color meter, to track a fruit's progression towards "ripe color."

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But now researchers have devised what might be a simpler and more scientifically accurate technique shooting fruit with lasers.

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When they zapped golden delicious apples, what bounced back was a speckled pattern of black and red dots: a measure of how the fruit's cells and water absorbed and reflected the laser light.

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That pattern changed over time, right in step with the fruit's release of ethylene.

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Meaning these images could be a good proxy for ethylene measurements, and let farmers know the best time to harvest.

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The study is in the journal Applied Optics.

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Next, the researchers hope to develop a handheld laser for farmers, so they can shoot fruit right on the tree.

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It remains to be seen if laser measurement of bananas will have¡ appeal.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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