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
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?