How a Sandbox Becomes an International Airport

Описание: A toy plane in the sand is the easy part. Then the slab snaps, the rain makes it skate, two planes want the same runway, and the fog rolls in.

A runway carries a 400-tonne jet on concrete about 40 cm thick laid over layers of crushed rock, and its surface is cut with grooves about 6 mm wide every 38 mm so rain can escape from under the tyres.

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