GARDEN CITY, NEW YORK—Live Science reports that a large, 14,000-year-old mammoth tusk has been uncovered at Alaska’s Holzman archaeological site. “The radiocarbon dates on this mammoth place it as one of the last surviving mammoths on the mainland,” said Kathryn Krasinski of Adelphi University. Krasinski and her team want to know if the tusk, which measures 55 inches long, was obtained by hunters, or if it was picked up by scavengers and brought to the site long after the animal died. If the mammoth was killed by hunters, this could indicate that the first Americans contributed to the extinction of the woolly mammoth some 10,000 to 12,000 years ago. For more, go to “Leftover Mammoth.”