Both Sigrid and Barbara like grammar and they talk about some of their pet peeves. The also agree that grammar isn't the most important thing. Using the language to communicate is more important.

Barbara talks about language programs called "dual immersion," student take their various classes in two different languages. She also describes her work as a copy editor.

When you are learning another language, you inevitably make mistakes. It's all part of learning, and can even help you remember how to use certain words, phrases, or grammar correctly. Barbara and Sigrid talk about mistakes they remember and never made again!

Barbara and Sigrid finish up their conversation with some considerations about watching movies in foreign languages. In particular, they speak about the advantages and disadvantages of subtitles and dubbing.

Julia and Rachael are young American women living in Berlin. Maggie, a friend of theirs from the United States, is coming for a visit. They are pretty excited about Maggie's arrival.

The three girls are happy to be reunited, and Maggie gets settled into the apartment. She feels lucky to have such good friends.

The three friends have breakfast together, do some catching up, and muse about the future. Who knows, will they all end up living together in Berlin one day?

Living together can be challenging, even for good friends. Maggie, as a guest and friend, can't help but notice that Julia is feeling frustrated about something.

It turns out that Rachael is also unhappy, and Maggie is feeling more and more uncomfortable about being in the middle of things.

Maggie decides to intervene, and finally the girls are encouraged to stop sulking and talk about their issues.

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

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

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.

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