This episode ended as something very different than it was when it began. Adam Savage explains why, and how MythBusters (including the infamous cement truck explosion) figured into its evolution.

Adam Savage was in his element creating the ZF-1, a device from The Fifth Element which combines six different weapons. But his conversation with Gary Oldman, who played Zorg in the film, was one of his favorite moments.

Savage Builds: Dogfight Derby combines WW1 airplanes, laser tag, and world-famous director Peter Jackson. How did this extraordinary episode come together? Adam Savage explains.

Adam Savage was DYING to include a food fight in Savage Builds, but the episode didn't come together until he landed on the PERFECT opponent: his friend and former MythBusters host Tory Belleci. Here's how it felt to film with Tory again.

Hawking explores the question of whether time travel is possible.

"Are We Alone?" An eye-popping journey from the moons of Jupiter to a galaxy perhaps not so far, far away in search of alien life. We'll see what aliens might look like, question what it means to be alive, and calculate the odds of making 'contact'.

Stephen Hawking spans the entire life cycle of the universe.

The greatest mind since Albert Einstein, Stephen Hawking tackles the question: Is there a meaning to life? Is there a purpose to our existence?

Stephen Hawking attempts to explain why the universe exists.

Stephen Hawking unfolds his vision regarding the existence of a creator.

Penn & Teller make 7 outrageous claims. 6 are true and one is a big fat lie! Stories include a head of hair can lift a car filled with people ten feet in the air, profanity can lessen pain, if you can land a plane with its doors open.

Penn & Teller make 7 outrageous claims. 6 are true and one is a big fat lie. Stories include a torch fueled by bacon can cut through steel, wrestlers can be defeated by a large cheese, and wallpaper is strong enough to withstand a wrecking ball.

Penn & Teller make six outrageous claims. Five are true and one is a big fat lie. Stories include: Roadkill can be healthy eating, 400 eggs can hold up a ton of cheerleaders, and piranhas will not kill you.

Penn & Teller make 6 outrageous claims. 5 are true and one is a big fat lie. Stories include: A butter knife can stop a speeding bullet, a man can fly through the air using hair bleach for fuel, and you can pan for gold on the streets of New York.

Penn & Teller make 6 outrageous claims. 5 are true and one is a big fat lie. Stories include: You can never cheat a carnival game, machine guns are designed to fail and helium is injected to cotton candy to make a dessert that floats.

Penn & Teller make 7 outrageous claims. 6 are true and one is a big fat lie. Stories include: A linen shirt can stop an arrow, a snail can crawl on a razor’s edge, a superhighway can sing and you can pour tea while upside down in an airplane.