Gautam carried some unusual baggage - a ground-penetrating radar and a top-of-the-line satellite navigation device. Unlike most climbers, he and his team remained at the summit for nearly two hours so they could take the measurements they needed. Gautam suffered a serious case of frostbite, and his colleague nearly died of a lack of oxygen while descending.

But they completed their mission: to obtain crucial pieces of data that will help determine Mount Everest's true height.

The most commonly accepted figure for Mount Everest's height is 29,029 feet (8,848 metres), a measurement that dates to the 1950s. Some scientists believe

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