Most people who hit a midlife crisis do something self-indulgent. NotGilles Elkaim. When he turned 40 in 2000, thisformer physics teacher embarked on a gruellingfour-year, 12,000-kilometre solo trek around the rim of the Arctic Ocean - in the interests of exploration, science and the study of loneliness. He even managed to get sponsorship from the European Space Agency, which wanted to apply lessonsfrom his experience of extreme isolation to future Mars missions. Jenny Hogan found out how he survived.
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