Homer Simpson would love Kevin's bowling ball that is engineered to be steered into the pins each time. Or is it?

Grant is sure of his advantage in a paintball bet if he's wearing night vision goggles he built out of materials rustled up in the garage.

The guys hit the range with a lot of duct tape, and a lot of scenarios to craft something to stop a 9mm Luger round.

In the first pool test of Kevin & Grant's homemade submarine, things start to go belly up when Grant smells smoke.

Kevin and Grant turn their first test - choosing a tire for the monocycle - into a project of its own. Giant tire bowling with trash can "pins."

The guys build their life size punching robots, complete with pneumatic power. Round one proves to be brutal.

The mission is to escape from the island using nothing more than what they would have had in the ‘50s. Grant is in a makeshift raft, Kevin is going to swim.

The guys have built dream motorcycle chariots, and as always they had different approaches for their builds. Let’s see what happens at the first test.

The guys each invest in some heavy junkers and modify them to stand up to their personal Mad Max demolition derby. Lots of spikes are used.

Kevin and Grant wire together a crazy homemade lie detector with spare parts in the garage. They’ve kicked it up a notch by adding a shock if they are caught in a lie.

Kevin shows how quicksand is created by agitating a sand and water mixture. With Grant standing in it as a test.

The guys test several "squirt gun" formats, with one powerful enough to knock down a brick wall. Once that's done, they're off to build a better version.

People jump off tall things. Grant and Kevin want to do it right, so part of the prep is to create a cushion. Their first test is with carboard boxes

Kevin and Grant watched the internet community jumping off things using small parachutes, umbrellas, and tarps to break their fall. Naturally, they tried it too.

Kevin and Grant build two different types of earthquake resistant test tables and their own seismograph. Initial tests in the back of Grant’s truck provided inspiration.

Fascinated the the aerodynamics and speed of hydrofoils, the guys decide to build one. They understand the science, but they’ve never done it before. Prototype testing reveals what to do next.

Grant is sure of his advantage in a paintball bet if he's wearing night vision goggles he built out of materials rustled up in the garage.

Two guys are out to right the wrongs of bad experiments and epic "this is bound to work" fails by showing what went wrong via science in action.

John Smith and his cousin Billy have a mysterious encounter while driving on a remote highway in the Yukon. Was it a UFO?

It's 1967, the Cold War is on and there's a glowing orange light hovering over a U.S. Air Force base.

Reports of a downed aircraft bring a volunteer firefighter to a remote wooded area.

The Hale - Bopp comet was overhead but a strange formation of lights in the sky didn't appear to be natural.

A Japan Air Lines pilot spots a mysterious object on his radar and sees bright lights outside the window of his aircraft.

A police officer spots a strange light in the sky in Minnesota. Things only get stranger after he crashes right into it... or it crashes into him.

A mysterious object stops right over John Hudson's car in the foothill of the Catskill Mountains.

First one police officer spots a flying object that seems to change shape as it travels - and then more officers see it.

A strange object hovering in the field of a Kansas farm leaves behind a glowing ring in the soil.

Dozens of people witness a strange object fall into the water and become submerged in Shag Harbour, Canada.

American soldiers stationed in England encounter unexplained lights in the forest and are given 'shoot on sight' orders.

It's 1975 at Loring Air Force Base, the largest strategic Air Force base in America - and a repository for nuclear weapons. Military officers at the base witness something unexplained.

Just after World War II, as the Cold War rolls on, one Swedish farmer sees what can only be described as a ghost rocket.

A farmer out for a regular drive in broad daylight sees something completely out of the ordinary: a 30-foot-wide flying saucer.