The sand dunes in the Nabib desert near Sossusvlei are among the highest in the world...some rising 300 m. It hasn't rained here in over a year or so and the temperature in winter soars to 35-40°C. A half-hour's climb to the top of a dune like the one in the right background results in the loss of a liter of water. But one doesn't perspire. The water loss is instantaneous and without perception, which makes dehydration something to worry about.
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