Puzzle master Will Shortz quizzes one of our listeners, and has a challenge for everyone at home. (This week's winner is Dean Corwin from Topeka, Kansas. He listens to Weekend Edition on member station KANU in Lawrence.)
A German engineer came up with an idea for a new kind of heart pump while still a student in the 1990s. His project eventually became a reality and has helped hundreds of thousands of people survive severe heart attacks.