Kateryna Skurydina goes to bed wearing thermal underwear, two jumpers and a scarf. She covers herself with a down duvet and two blankets. But her secret weapon is her cat, Pushok.

At its height, the United States operated 50 military installations in Greenland—and once had fantastical plans for an elaborate nuclear missile network underneath its ice.

Today in History for Jan. 17: In AD 356, Antony of Egypt, considered the founder of Christian monasticism, died at age 105. In 1377, despite the protest of powerful French cardinals, Pope Gregory XI ...