LESSONS FROM THE DEAD - Scientists attempt to bring back an extinct frog. Mummies showing signs of heart disease make researchers rethink assumptions about lifestyle and diet. The mysterious death zone within African "fairy circles" explained. Also: a miniature laboratory under the skin monitors blood chemistry.
HISTORY MEETS SCIENCE - Dairy detectives discover ancient milk, the historical practice of bloodletting gets a second look, and revisiting failed ideas for saving lives. Also: What migraine headaches and the Mutiny on the Bounty have in common.