natural history en Simon Winchester: SKULLS <p></p><p>Skulls are potent symbols of death, life and danger, and they also can tell a fascinating story about natural history. Ross Reynolds talks with writer <a href="">Simon Winchester</a> about his new book about skulls and a man that obsessively collects them. Wed, 03 Apr 2013 19:00:00 +0000 Ross Reynolds 4353 at Simon Winchester: SKULLS Fresh Clues In Dinosaur Whodunit Point To Asteroid Some 66 million years ago, about 75 percent of species on Earth disappeared. It wasn't just dinosaurs but most large mammals, fish, birds and plankton. Scientists have known this for a long time just from looking at the fossil record. If you dig deep enough, you find lots of dinosaur bones. And then a few layers up, they're gone.<p>But scientists couldn't figure out exactly what had caused this phenomenon. Of course, there were lots of theories.<p>"Some of them are pretty wacky," says <a href="">J. Thu, 07 Feb 2013 21:49:00 +0000 editor 7876 at Fresh Clues In Dinosaur Whodunit Point To Asteroid