NPR reports. "Tom Magliozzi, one of public radio's most popular personalities, died on Monday of complications from Alzheimer's disease. He was 77 years old. Tom and his brother, Ray, became famous as "Click and Clack the Tappet Brothers" on the weekly NPR show Car Talk. They bantered, told jokes, laughed and sometimes even gave pretty good advice to listeners who called in with their car troubles."