Actress Marcia Wallace has died at age 70. She was a fixture on American television for decades, thanks to long-running roles on The Bob Newhart Show andThe Simpsons.
Angela Weiss/Getty Images
Ali Maow Maalin said he avoided getting the smallpox vaccine as a young man because he was afraid of needles. He didn't want others to make the same mistake with polio.
Courtesy of the World Health Organization