Iowa Public Television, noting that time has reduced George Washington Carver’s legacy to “the man who did something with peanuts” in some circles, has documented his rise from slavery to scientific achievement. “George Washington Carver: An Uncommon Life” premiers at 8 p.m. April 30. The show explores his complexities and impact, with interviews from three campuses that helped mold him: Iowa State University, Simpson College and Tuskegee University. A second airing will be at 1 p.m. May 6.