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This is Scientific American's 60-second science. I'm Christopher in Talata. Got a minute?

The sound of supernatural spirits talking? Well, no. But that's what it sounded like to Marco Polo,

as he traveled through China's Lop Desert in the 13th century.

He also described the sound as a variety of musical instruments.

And in reality, the mysterious noises are the product of what could be considered to be an unusual sort of instrument, the desert sand dunes.

And it's a sound that, again, it's very similar to kind of the tones you get

on a cello. Melanie Hunt, a mechanical engineer at Caltech. The dunes sing when sand avalanches down the

side. Which would then be somewhat equivalent to using the bell on the strings of the cello.

Hunt and her colleagues recorded the sounds produced closer to home by California's

Kelso and Eureka Dunes.

They used four dozen geophones, microphones as stick in the sand, and they mapped the

dune's structure with ground-penetrating radar.

Turns out dunes that sing are built differently from silent dunes.

They're topped with an even layer of dry sand,

about five feet thick,

on top of all the damp sand below.

And that layer of dry sand is like the body of an instrument.

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