A sign-language expert is getting a genius grant from the MacArthur Foundation. Carol Padden will receive $500,000 over the next five years, with no strings attached. Padden is a communication professor who teaches at the University of California, San Diego. She plans to use the money to show "that sign languages belong in the class of human languages." She's one of 23 MacArthur Foundation grant winners this year. Both she and her brother as well as her parents are deaf. They are retired from teaching at Gallaudet University.