The time travelling machines of Hollywood movies offer infinite opportunities, but could time travel ever really be more than science fiction?

Some of the brightest minds and theorists on the planet explore the limits of human knowledge and explain the science behind the rules of the universe.

Earth is spinning on a tilted axis as it orbits around the Sun. Experts and scientists explain how the planet journeys through the Milky Way.

Paranormal investigators reveal a bold new theory about the origins of the Wendigo. Are the stories of this terrifying creature with cannibalistic cravings true?

Experts investigate evidence suggesting that one of the world's most elusive figures, the Yeti, lives in America and may have an otherworldly source.

New theories claim the sunken city of Atlantis may have been in the Americas. From the Bahamas to an ancient site in Louisiana, Rob and Stefan seek the evidence.

A strange cave freezes in summer and melts in winter, and a huge sand dune swallows a small child in an instant. Rob and Stefan explore these mysteries.

More everyday items are put under the microscope as we discover how rawhide lampshades and MRI scanners are made.

More everyday items are put under the microscope as we discover how membrane filters, bridge ties, and Bi-planes are made.

More everyday items are put under the microscope as we discover how hospital laundry and horse replicas are made.

More everyday items are put under the microscope as we discover how ceramic fireplaces and parking garage floor slabs are made.

More everyday items are put under the microscope as we discover how oil pressure sensors are made and neck restraints are manufactured.

Supernovas are the violent death of giant stars. New discoveries reveal how these events create the elements that are essential to all life in the universe.

Black holes aren't simply violent monsters. New discoveries reveal their importance in creating stars, giving light, and building the universe itself.

Nebulas are the strange structures of cosmic gas and dust where stars are born and die. New discoveries reveal the secrets of these mysterious places.

Justin's in for a bumpy ride as he investigates gigantic potholes in Louisiana. Later, he heads to London to get a sneak preview of London's vast Crossrail project.

German workers are exposed every day to major hazards as they build the massive skyscrapers, tunnels and other construction projects of the modern world.

More everyday items go under the microscope with a look at how objects such as lace and unicycle wheel hubs are made.

More everyday items go the microscope. How are external hard drives, Thai rice boxes and paper towels made?

More everyday items go under the microscope with a look at how objects such as tea, artificial flowers and alloy wheels are made.

More everyday items go under the microscope with a look at how objects from gel caps to frozen pancakes are made.

More everyday items are put under the microscope as we discover how paper umbrellas, coal, aircraft seats and urns are made.

More everyday items go under the microscope with a look at how objects including aluminium canoes, wood bowls and marimbas are made.

Darrell focuses on a multi-million-dollar wreck tied to Sir Francis Drake. He and his team race to locate a treacherous area identified on the map as Dragon's Teeth.

Darrell and the team head to a mysterious island where they discover valuable clues that lead them closer in the hunt to a 500-year-old shipwreck.

The discovery of extra-terrestrial life faces a near impossible challenge. Experts explore the problems with proving or disproving the existence of aliens.

New scientific discoveries reveal that the moon has an incredible, violent, and dynamic history. Was the moon originally more similar to earth than previously thought?

What happens when galaxies containing billions of stars collide? The gravitational forces of these giants intersect, and they are left irrevocably changed.

More everyday items are put under the microscope as we discover how NASCAR car bodies are manufactured and thermal coffee pots are produced.

More everyday items are put under the microscope as we discover how slate tiles are produced and hot dog carts are made.

More everyday items are put under the microscope as we discover how racing leathers are manufactured and wood rocking chairs are made.

More everyday items are put under the microscope as we discover how mountain bikes are produced and lever action rifles are manufactured.

More everyday items are put under the microscope as we discover how saunas are produced and wheelchair lifts are manufactured.

More everyday items are put under the microscope as we discover how upright pianos are manufactured and flags are produced.

More everyday items go under the microscope. What are the production processes behind common objects including Asian bowl meals and walking canes?

More everyday items go under the microscope. How are common objects including power trainers and coffee pods made?

More everyday items go under the microscope. What are the production processes behind common objects such as beehives and cast iron cookers?

More everyday items go under the microscope. What are the production processes behind common objects including ochre and hurdy gurdies?

How do they build a tractor every three minutes to power Indian agriculture? How do they cast the bronze bells that help Swiss farmers keep track of their cows?

How do they collect millions of real birds' nests to make birds' nest soup? Plus, how do they use aerospace technology to make rowers go faster?

How do they quadruple the power of the world's biggest engines with the most powerful turbochargers? How do they build new roads from old waste plastic?

How do they harness the wind to power a racing yacht to Olympic gold? How do they make a sword fit for an officer at the world's largest sword factory?