He swam across the English Channel and now he's found a bigger challenge. Andrei Roşu is getting ready for his toughest competition so far: a seven-day Polar Circle Marathon - the coldest race on Earth. So, Andrei is sleeping out on his balcony, these days, to get used to very low temperatures. Last night, he slept through 5 degrees Fahrenheit and he hopes to improve his performance in the nights to come.