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

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.

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.

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

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

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.

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?

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

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.

Annette sharpens her skydiving skills in a vertical wind tunnel in Slovakia. The wind reaches a speed of 180 kilometers per hour (112 mph).

Annette takes us on a tour of her conversion van named Hermes, a van that has been, in her case, converted into a living space. In addition to the basics, she has equipped the van with many of the comforts of home.

Annette gives us some tips on using yoga moves to give our muscles a break when on a road trip.

Greentraveller's Richard Hammond shows you some of the loveliest and greenest spots in London, and gives some tips for navigating through the city.

Yabla's Lauren takes us on tour of Oxford Street, the busiest street in central London!