Conflicting results make determining the age of the universe difficult. Finding the answer could be the key to many mysteries of the cosmos.

More than 100 million pieces of small space debris are floating around the Earth. A big collision between two of these objects in low Earth orbit could be catastrophic.

Aliens could be lethal killers who want to invade and plunder our world. A team of experts investigate extra-terrestrial beings and their threat to human life.

Until recently, black holes were only theoretical. Now, scientists know that millions exist and some of them have the potential to be lethal to earth.

Rob Nelson hunts for a mass grave that could expose a dark secret. Plus, a giant lake is mysteriously disappearing and Rob set off to find out why.

Rob examines bizarre markings that suggest a violent clash between prehistoric beasts. In California, he explores if a strange lake is a home to alien life.

How do they blow the world's finest crystal, heat the deepest swimming pool, and fill a million bottles a day of the world's favourite ketchup?

How do they turn Sheffield steel into a carpenter's handsaw, make a microphone that can pick up a whisper, and safely steer through a frozen river?

How do they mine one of the rarest gemstones in the world, craft the classic cowboy boot, and build a road sweeper that can pick up seven tonnes of trash?

How do they make the world's softest duvets, drill for oil thousands of metres below ground, and put the stretch in rubber bands?

How do they build a diesel engine that can fly, make cough sweets, turn clear plastic into bank notes, and whip up ice cream flavours?

A series of strange animal deaths and UFO sightings brings Chuck to Colorado. Reports of authorities ignoring these incidents suggest a government cover-up.

Chuck receives a map supposedly leading to a hidden cache of recovered materials from the Roswell incident. He and his team go on an epic treasure hunt to find them.

A recent creature sighting outside the infamous Skinwalker Ranch brings Chuck and the team to Utah to investigate. Evidence indicates it might be an alien.

Darrell heads to a shipwreck linked to Gordo's list. He leads his team to the shallows where the tough winds and waves have claimed centuries worth of ships.

After finding evidence of a 1700s-era lifeboat near shore, Darrell and the team discover the shipwreck it came from. But a sudden tragedy hits the expedition.

How do they make one of the world's fastest bikes? How do pilots train for death-defying acrobatics? And, how do they bring oil and gas up from the bottom of the sea?

How do they hand-roll New York bagels? How do they make a racing car tyre to grip the track at 320 km an hour? And, how do they make lifelike sculptures out of glass?

How do they collect the trash in road-free Venice? How do they make Australia's famous sheepskin boots? And, how do they turn pond algae into a health supplement?

How do they turn rosebuds into Turkish Delight? How do they hammer out a silver spoon? And, how do they make sunscreen to block out harmful UV light?

How do they create the world's finest canvases? How do they cook up foul-smelling stinky tofu? And, how do they get fifty drinks out of a single bottle of beer?

How do they look after bees to make millions of jars of honey? How do they build a trike to carry the whole family, and how to stop a bullet with a sheet of ceramic?

Rob Nelson investigates the mysterious rocks at the bottom of Lake Michigan known as Underwater Stonehenge. Plus, the search for escape tunnels in Alcatraz.

Rob Nelson investigates mysterious tunnels under Denver's airport. Plus, in Ohio he tries to uncover the secrets of a giant serpent-shaped mound.

The mysterious dark matter is thought to be the cosmic glue that holds the universe together, yet the search for it continues to puzzle scientists.

Conflicting results make determining the age of the universe difficult. Finding the answer could be the key to many mysteries of the cosmos.

Some think the waving US flag on the moon proves that NASA faked the lunar landing. Experts' quest for the truth leads to some of Hollywood's biggest names.

How do they build the ultimate car crushing colossus? Plus, how do Lea and Perrins concoct their Worcestershire sauce?

How do they build a float for New Orleans Mardi Gras parades? Plus, how do they stir, stretch and pull sugar to make rock candy?

How do they harvest and treat the world's most expensive tea? Plus, how does the Siekierki power plant of Warsaw, Poland heat half the city's homes?

An insider's look at how the classic British bike is made, how radiation can be used to take down crime and the process behind mechanised milk.

How do they blend science and destruction at crash test centres? And how do they piece together the complex mechanism of a pocket sized umbrella?

How do they forge the blades to crack open oyster shells? Plus, how do scientists in a lab grow the synthetic diamonds of the future?

Russell finds a structure he believes is a Bigfoot nest. Meanwhile, new team member Ronny joins Mireya in a race to the nest to collect DNA samples.

Mireya and Ronny make a powerful discovery in the area around the nest. And, Bryce suspects Bigfoot is emitting infrasound to repel the team from its territory.

Justin and Emiliano investigate the possibility that the Knights Templar fled Europe and rebuilt their order in the Americas a century before Columbus.

Justin and Emiliano investigate an international conspiracy involving the highest levels of government. Could this prove Meriwether Lewis was assassinated?

How will the universe end? Experts discuss the many possible ways that could spark the beginning of the end for the universe including when and why it would happen.