Washing water is piped down 700 meters (2, 300 feet) from the surface to the refuge once it has been heated by a solar-powered heater.

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Finally the glass surface onto which the apparatus was attached was immersed into a liquid heated to 300C (572F).

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True to form, when he finally begins the shave, the blade slides across the surface of my face, cutting the whiskers as if they were gently heated butter.

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When heated to a high temperature, the bath gives off a mist of atoms that fall on to the surface of the object.

ECONOMIST: MONITOR