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[RAIN]

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[MUSIC PLAYING]

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This drop of water falling on soil is about to 
liberate the smell of rain,

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which actually comes from the earth, not the water.

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The scientist at MIT who made this video knew that much,

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what they didn't know is now captured on video is how it happened.

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You have to have the right size drop,

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falling at the right speed,

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on the right surface.

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As it hits the ground, it traps tiny bubbles of air.

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Those bubbles then burst from the drop like fizz from champagne,

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and they carry with them the smell of the earth,

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or rain-washed pavement,

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or wherever they fall.

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These bubbles are not just capturing the molecules in the earth that smell good,

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they could also be transporting viruses or bacteria that cause diseases.

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So it's bound to be useful to learn more about how it works.

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[RAIN]

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