Alan Alda has always been an advocate for science. Alan has always been interested in science and even hosted PBS's Scientific American Frontiers from 1993 until the show's end in 2005.

While hosting the long-running PBS series “Scientific American Frontiers,” Alda realized how much his skills as an actor and improviser prepared him for interactions with scientists.

While hosting the long-running PBS series “Scientific American Frontiers,” Alda realized how much his skills as an actor and improviser prepared him for interactions with scientists.

While hosting the long-running PBS series “Scientific American Frontiers,” Alda realized how much his skills as an actor and improviser prepared him for interactions with scientists.

While hosting the long-running PBS series “Scientific American Frontiers,” Alda realized how much his skills as an actor and improviser prepared him for interactions with scientists.

Alan Alda kept his boots ... it attracted the largest U.S. audience for any TV show ... While hosting the long-running PBS series “Scientific American Frontiers,” Alda realized how much his ...

Alan Alda kept his boots ... it attracted the largest U.S. audience for any TV show ... While hosting the long-running PBS series “Scientific American Frontiers,” Alda realized how much his ...

File video above: Alan Alda says has no plans to retireThe combat boots and dog tags that Alan Alda wore to portray the wisecracking surgeon Hawkeye on the beloved television series "M*A*S*H ...