A collapsed bridge

Why Bridges Collapse

In 2018, Italy's Morandi Bridge collapsed, killing 43 people. NOVA investigates what went wrong and explores other bridge collapses across the United States. How can new engineering techniques make bridges safer and prevent such tragedies?

Get the free PBS App

Full Episodes

Upcoming Airdates

Bigger Than T.rex

Almost a century ago, paleontologists found the first tantalizing hints of a monster even bigger than Tyrannosaurus Rex, perhaps the largest predator ever to walk the Earth: spectacular fossil bones from a dinosaur dubbed Spinosaurus. But the fossils were completely destroyed during a World War II Allied bombing raid, leaving only drawings, lots of questions, and a mystery: What was Spinosaurus? Now, the discovery of new bones in a Moroccan cliff face is reopening the investigation into this epic beast. What did it feed on and how? Why did it grow so big?

  • 2019-12-15T14:00:00-08:00
  • 2019-12-15T17:00:00-08:00
  • 2019-12-16T06:00:00-08:00

Inside Animal Minds: Who's The Smartest?

What would it be like to go inside the mind of an animal? We have all gazed into a creature's eyes and wondered: what is it thinking about? What does it really know? Now, the revolutionary science of animal cognition is revealing hard evidence about how animals understand the world around them, uncovering their remarkable problem-solving abilities and exploring the complexity of their powers of communication and even their emotions. In this mini-series, NOVA explores these breakthroughs through three iconic creatures: dogs, birds and dolphins.

  • 2019-12-22T14:00:00-08:00
  • 2019-12-22T17:00:00-08:00
  • 2019-12-23T06:00:00-08:00

The Planets: Inner Worlds

The rocky planets - Mercury, Venus, Earth and Mars - were born of similar material around the same time, yet only one supports life. Were Earth's neighbors always so extreme? Is there somewhere else in the solar system where life might flourish?

  • 2020-01-12T14:00:00-08:00