In this segment, we learn about the role weather plays in the creation of rock formations in the national parks of the United States.

This song was written and sung by Bob Dorough. It teaches about the multiplication of 5 through a game of hide and seek, in which the seeker counts by fives.

Watch some coverage of the People's Climate March that was timed to coincide with the UN Climate Summit in New York City. The march was attended by 400,000 people.

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.

"One" and "ones" can replace nouns, but are not pronouns. They are prop words. Let's look at how they are used.

Why are some rock formations and animals found on more than one continent? The explanation dates back to the Ice Age.

Why do some of the national parks in the United States resemble the European Alps? Geologist Dr. Robert Darga answers this question.

Meet Sheldon, he’s been driving pizzas longer than anyone at Bob’s Pizza. He seems to be a little too comfortable in his role of senior pizza driver!

Here's the trailer for an inspiring film about the efforts of ordinary people to make the world a more sustainable place. Experts talk about the necessity of taking action.

An animated video of the festive British carol, “We Wish You a Merry Christmas.” The carol's origins are not known, but it was first written down in 1935 by Arthur Sydney Warrell, a Bristol choirmaster.

The recap of a hilarious season of Two and a Half Men, in which tech billionaire Walden moves in with the guys, and has heaps of trouble deciding between his new girlfriend Zoey and ex-wife Bridget.

Cherry realizes quite late what is actually going on. Beaufort levels some nasty criticism at Cherry for her acting abilities, and the producer of the film shows up.

Who knows when we'll discover whether we are alone in the universe or not? Whatever the answer, the quest for more knowledge will never cease, nor grow dull.

Bohemian Rhapsody is a biographical film about the British rock band Queen, focusing on lead singer Freddie Mercury's life leading up to Queen's Live Aid performance at Wembley Stadium in 1985. Freddie defied stereotypes and shattered convention to become one of the most beloved entertainers on the planet.

Catch up on winter vocabulary with Sigrid. It's also a great chance to practice words with "W," since there are plenty associated with winter.