Fossil Pushes Back The Age Of Dinosaurs
A fossil in Tanzania suggests dinosaurs appeared 10 million years earlier than previously thought, according to a <em>Nature</em> study. Christian Sidor, of the Burke Museum of Natural History and Culture at the University of Washington, discusses the origin of dinosaurs.
Retiring baby boomers are taking with them years of institutional memory in many fields. It's an issue raised by David DeLong, author of <EM>Lost Knowledge: Confronting the Threat of an Aging Workforce</EM>. Hear DeLong and NPR's Steve Inskeep.