Training For War, Mathematical Mind Blowers, Balkan Music

The mock villages at the National Training Center at Fort Irwin, Calif., are meant to simulate urban environments that soldiers might encounter in Afghanistan. // NPR, Rebecca Hersher
At Fort Irwin in the Mojave Desert, soldiers train for war on foreign soil; a new book details how calculus rocked world history; musician Jordi Savall explores the music of the Balkans.