Episode Details

The newly described Tylosaurus rex was a violent bus-sized Komodo dragon-like creature with serrated teeth. Dubbed the ‘T. rex of the sea,’ it would have occupied the top of the food chain in the marine ecosystem over 80 million years ago.

PLUS:

• Pigeons use their livers to find their way home
• From the archives: How Jocelyn Bell Burnell discovered pulsars 
• Scientists discover an underground network of lakes hidden under Arctic ice 
• New book explores the million year history of how we sleep — and why we’re doing it wrong today