When I crossed into the mainland a few weeks later, I was questioned vigorously by customs officials while remote scanners evaluated my body temperature.

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He said the new integrated temperature control system was like a giant television remote control which would allow for very tight control of heat and electricity consumption.

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On Christmas Day, "in one of the coldest and most remote places on earth" Mr Evans and Mr Somers skied for six hours in a temperature of -21C.

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