You've made it to the final round of a game show, and get to pick between 3 doors, one of which has a car behind it! You make your choice, and then the host decides to show you one of the wrong answers. He then offers you the opportunity to change your choice. Should you do it? Find out just how wrong human intuition can be in this classic Monty Hall Problem.

The trailer for the Marx Brothers’ fourth film Horse Feathers.

This is a peek into the making of American indie pop band Fun's unique video for their hit song "We are Young," which won them a 2013 Grammy award for song of the year. The song and video feature American R&B musician Janelle Monae along with the band Fun, which is made up of Nate Ruess, Andrew Dost and Jack Antonoff.

This hilarious sketch making fun of the art world (Jeff Koons'"Balloon Dog" sculpture as an actual balloon dog) is unfortunately all too accurate. Written and created by Chelsea gallerist and comedian Jim Kempner, it is part of the web series The Madness of Art. Enjoy!

Imagine having the chance to make the stars of stage and screen look perfect, and come face to face with the Royal family, every day. Watch and share Rebecca's London story as the colouring artist at Madame Tussauds London shares some of the behind the scenes secrets of her role, the traditional techniques used to create the ever-changing wax figures on show and the places she loves in London when she's not rubbing shoulders with the rich and famous.

Meet Barney, one of the Yeoman Warders of The Tower of London, known as Beefeaters, who lives and works at the royal palace. Watch and share his legendary London story. From his passion for making sure ravens stay at The Tower and pride in carrying out one of the oldest traditional ceremonies in history, Barney explains why he passionately believes London is the greatest city on earth.

Do you know your Turner from your Warhol? If not, don't worry, London is the perfect place to explore the art world through its wealth of museums. Watch and share Marcus's London story and let him take you on a journey of discovery. This Tate Modern curator is just one of the passionate staff waiting to introduce you to the people and ideas housed within the walls of the imposing former power station. Directly opposite St Paul's Cathedral across the Millennium Bridge, Tate Modern sits on the South Bank among one of the most vibrant new parts of the city.

James Corden and Ed Sheeran go for a drive in Los Angeles singing songs off Ed's new album. James challenges Ed to fit as many Maltesers as possible in his mouth after hearing that Ed once fit in 47. Maltesers are a UK brand of chocolate-covered malted milk balls.

Ed sings some tunes with James Corden in the car, and talks about a bender with Justin Bieber in Tokyo. It started at a dive bar and ended up on a golf course.

Ed Sheeran talks about preferring to have his guitar and not just a microphone when he's singing. They sing “Castle on the Hill” and James comes up with a little variation inspired by Los Angles traffic.

In Yellowstone Park, visitors can see many indigenous animals in their natural habitat and wonder at the park's natural hot springs.

Geysers represent a very popular tourist attraction in Yellowstone Park. How do they work and where do they come from? And what is sandstone? The video answers these questions.

We learn more about how water interacts with the minerals in the rocks, and visit Monument Valley, a popular spot for filming westerns and commercials.

The Colorado Plateau and the Grand Canyon are just a few of the amazing geographical features of the Southwestern United States.

We visit Bryce Canyon, where valuable fossils have helped understand the geological history of the planet. The sandstone spires of the canyon are breathtaking.