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This is Scientific American's 60-Second Science. I'm Wayt Gibbs.Got a minute?

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I'll never forget the day I saw the first ultrasound image of my peanut-size son-to-be.

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If only the pictures weren't so fuzzy.

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Is it a boy or is that her foot?

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Now physicists at Nanjing University in China have come up with a method to clean up pictures made from high-pitched acoustic waves.

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Think of a one-way mirror, but for sound.

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Their system would let the pressure waves that carry sound pass through if they come from the left.

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But it reflects waves hitting it from the right.

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No known natural material can do this.

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But a metamaterial, a clever arrangement of thin brass plates bent into tiny maze-like shapes has just the right properties.

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The metamaterial can even be tailored to steer the outgoing sound and to filter out all sounds except those of a particular frequency.

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That's just what you want for a sharp ultrasound picture.

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The work appears in Applied Physics Letters.

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The researchers are now building a prototype of their design.

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Maybe one day, the only thing fuzzy about those first fetal photos will be the way they make you feel inside.

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

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