In 2008, reports of polar bears' inevitable march toward extinction gripped headlines. Stories of thinning Arctic ice and even polar bear cannibalism combined to make these predators into a powerful symbol in the debate about climate change.
The headlines caught Zac Unger's attention, and he decided to write a book about the bears.
The Japanese Meteorological Agency says an extremely strong earthquake rattled the northern Japanese island of Hokkaido on Saturday. The magnitude was 6.4. The U.S. Geological Survey's report puts the tremor at a higher magnitude of 6.9; the epicenter was very deep, about 65 miles below ground, near the city of Obihiro. That's about 120 miles east of Hokkaido's largest city, Sapporo.