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COVID spreads in China

Unexpected Elements

00:00

Cloud Science on BBC World Service

Tropical islands act like launching pads driving moist air upwards where water vapor can condense into fluffy cumulus clouds. On a stable summer's afternoon you might look at to find fun shapes in them. These cumulus clouds have crisp edges and that makes them the best for finding shapes. Why do they have these crisp edges what keeps that cloud Emily just saw together in a squirrel shape when all the droplets could just drift away? It's surprising how little those two regions of air mix.

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