Here are some words to help answer the question "Which one?" We distinguish between singular and plural as well as between something close to us and far away.

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

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.

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.

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.

Hindi-English, Chinese-English, and Singaporean-English are discussed and we're introduced to some fun words, such as “badmash” (noun, a bad person in Hinglish) or “chope” (verb, to set aside a place in a fast food restaurant by setting down an object like a hankie or magazine in Singlish).

We can use nouns, verbs, or adjectives to describe someone's personality. Sigrid shows us how to describe someone with a strong personality.

Here's how to pronounce a very important noun with an unusual plural!

True possessive pronouns can stand alone. They replace both the noun and its possessive adjective or determiner. These pronouns are very handy in introductions and conversations about favorites.