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

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Unless you have a pair of noise-canceling headphones, flying can be annoying to the ears.

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A lot of low-pitched rumbling makes it into the cabin.

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Problem is, the wings, floors, ceilings and bulkheads are lined with a lightweight material with a honeycomb structure, which adds structural integrity to the aircraft, but engine and airflow sound cuts right through.

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"The physical law says that the lighter the material is, the worse it can block sound."

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Yun Jing is an acoustician at North Carolina State University.

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In a quest for quiet, he and his colleagues constructed a similar material,

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but with a quarter-millimeter thin layer of latex stretched across the cells of the honeycomb.

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In tests, the latex-laced structure cut the intensity of low-frequency rumbling to a thousandth of its previous level, enough, he says, to make an airplane cabin sound more like a peaceful living room.

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The study is in the journal Applied Physics Letters.

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Problem is, the material Jing developed is six percent heavier than the standard stuff.

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And more weight means more fuel means more expense.

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But if we settled for a slightly quieter flight, Jing says he could use less latex, making the noise-blocking honeycomb just a few percent heavier.

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Considering that the honeycomb is already one of the lightest parts of an airplane, you're then looking at only a modest plane weight gain.

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Of course, that's assuming everyone wants a quieter plane.

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"Some people say they actually want to hear the sound of the engine.

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They don't want the cabin to be too quiet.

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They want to make sure the plane is still flying."

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Sounds like you'll need those expensive headphones a little while longer.

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

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