Melting ice in Norway gave up a 5,000-year-old arrow — and 47 more

For twenty years, Norway's Secrets of the Ice team has been racing the melting glaciers of Jotunheimen, knowing that what thaws doesn't keep. A recent three-week expedition paid off: 48 prehistoric arrows, including a slate arrowhead estimated at 5,000 to 6,000 years old, left behind by reindeer hunters millennia before the present. Ice pauses decay, so wood, leather, and stone survive nearly as they were. The team has now recovered more than 5,000 artifacts from 73 sites — each one a postcard from people who walked these mountains thousands of years ago.