Ohio/Lifeline/The Pentagon's Ray Gun - S40.E23

"Ohio" talks to Hillary Clinton and Barack Obama about the Ohio primary which may determine which candidate gets the presidential nomination. "Lifeline" looks at a group of doctors who are trying to bring free medicine to remote parts of the world. "The Pentagon's Ray Gun" looks at a non-lethal weapon being developed by the military. "Andy Rooney" talks about the presidential race.