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Environment and energy

Environment and energy

Courtesy: iStock/lucky-photographer
17 Apr 2018
This article first appeared in the April 2018 issue of Physics World

The ability of trees to cool by transporting water from their roots to the leaves has been known for centuries. But as Stephen Ornes discovers, the principles of transpiration are also inspiring innovative techniques to cool vehicles travelling at hypersonic speeds, where unwanted heat is a problem too

The tallest known tree in the world is in Redwood National Park, a few hundred kilometres north of S

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