WEBVTT

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<i>Rainfall</i>

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<i>Music</i>

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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

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knew that much.

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What they didn't know, but now

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captured on video, is how it happens.

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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

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like fizz from champagne.

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And they carry with them
the smell of the earth,

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or the rain washed pavement, 
or where ever they fall.

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These bubbles are not just capturing

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the molecules in the earth that smell good,

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they could also be transporting

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viruses or bacteria that cause diseases.

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So its bound to be useful to learn

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more about how it works.

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<i>Music</i>

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<i>Rainfall</i>