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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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If you've ever craved an ice-cold soda, you know that sometimes you're just looking for something that tastes…fizzy.

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If that sounds odd, scientists have discovered that carbonation actually has a flavor.

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And that our taste buds can sense CO2.

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Bubbly soft drinks tickle our tongues with their effervescence.

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But researchers got to wondering whether we can taste the carbonation.

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To find out, they studied mice whose taste cells had been turned off, one flavor at a time.

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So, one mouse couldn't taste sweet things, another couldn't taste bitter, a third couldn't taste salt, and so on.

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They found that mice lacking the cells that sense the taste sour no longer respond to CO2.

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Probing further, they discovered that eliminating a single gene renders these mice blind, if you will, to the taste of carbonation.

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That gene encodes an enzyme that breaks down CO2. and water…don't forget the water—into bicarbonate and protons.

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And it's the protons. which are essentially acid that the sour-sensitive cells seem to sense.

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The work appears in the journal Science.

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The scientists speculate that our CO2 sensor evolved to help us avoid food that's spoiled.

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Yet we still like some of our drinks to include the delightfully acidic tingle of a touch of CO2.

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

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