There is a parlor game physics students play: Who was the greater genius? Galileo or Kepler? (Galileo.) Maxwell or Bohr? (Maxwell, but it's closer than you might think.) Hawking or Heisenberg? (A ...

Over two hundred fifty million years ago, India, Africa, Australia, and South America were all one continent called Pangea. Over the next several million years, this giant southern continent proceeded ...

(Program not available for streaming.) Fifty years later, what can science tell us about the Kennedy assassination—and the investigations that followed? The 1963 murder, in broad daylight in front of ...