Season 40
Will future asteroids trigger massive extinctions—or be mined for precious minerals?
Asteroid: Doomsday or Payday?
Can scientists unravel the mysterious phenomena that lurk between Earth and space?
At the Edge of Space
Oklahoma's Deadliest Tornadoes
Hear stories from survivors of Moore’s tornado and meet scientists who stalk these storms.
Oklahoma's Deadliest Tornadoes
Which technologies worked in the race to track down the men behind the marathon attack?
Manhunt—Boston Bombers
A meteor burst into a fireball over Siberia. Can we spot the next deadly asteroid in time?
Meteor Strike
Australia's First 4 Billion Years: Strange Creatures
After a massive extinction, diverse marsupials came to dominate this isolated continent.
Australia's First 4 Billion Years: Strange Creatures
Australia's First 4 Billion Years: Monsters
Some 250 million years ago, some of the largest, most dangerous reptiles ruled this land.
Australia's First 4 Billion Years: Monsters
Australia's First 4 Billion Years: Life Explodes
Fossils reveal how life’s explosion in the ocean was recreated on dry land.
Australia's First 4 Billion Years: Life Explodes
Australia's First 4 Billion Years: Awakening
Australia’s landscape holds clues to Earth's early history and the beginning of life.
Australia's First 4 Billion Years: Awakening
Can science help us understand why some people commit horrific acts of mass murder?
Mind of a Rampage Killer
Detailed satellite images reveal the web of connections that sustain life on Earth.
Earth From Space
A team uncovers the advanced engineering behind an ancient Egyptian war machine.
Building Pharaoh's Chariot
Could the explosion of Iceland's ticking time bombs cause cold and famine worldwide?