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1 .This is Scientific American's 60-Second Science.I'm Karen Hopkin. This'll just take a minute.
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2 .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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3 .If that sounds odd, scientists have discovered that carbonation actually has a flavor.
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4 .And that our taste buds can sense CO2.
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5 .Bubbly soft drinks tickle our tongues with their effervescence.
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6 .But researchers got to wondering whether we can taste the carbonation.
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7 .To find out, they studied mice whose taste cells had been turned off, one flavor at a time.
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8 .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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9 .They found that mice lacking the cells that sense the taste sour no longer respond to CO2.
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10 .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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11 .That gene encodes an enzyme that breaks down CO2. and water…don't forget the water—into bicarbonate and protons.
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12 .And it's the protons. which are essentially acid that the sour-sensitive cells seem to sense.
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13 .The work appears in the journal Science.
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14 .The scientists speculate that our CO2 sensor evolved to help us avoid food that's spoiled.
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15 .Yet we still like some of our drinks to include the delightfully acidic tingle of a touch of CO2.
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16 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.
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