China's Shenzhou 15 capsule lands safely with 3 Tiangong space station astronauts (video)
Fossils reveal a predator's desperate struggle to survive Earth's worst extinction. The Permian extinction wiped out 70 percent of known land species. Those who survived had to get creative. Others fought for their last gasp.
Watch China's Shenzhou 15 astronauts return to Earth this weekend (video)
