Joe Palca Joe Palca is a science correspondent for NPR.
Stem Cells Reverse Paralysis in Rats
Lizz Wright Debuts With 'Salt'
Weapons of Mass Destruction
Looking for HIV Vaccine Volunteers
Scientists Criticize Limits on Stem Cell Research
Gene Therapy Shows Promise for Treating Deaf
Mule Joins List of Cloned Animals
SARS Treatment Tested as New Cases Arise
U.S. Bans Canadian Beef Imports after Mad-Cow Case