How do coral reefs form, and what role do they play for underwater creatures such as fish? In this video, you can see some fascinating life forms and how they interact with one another.

In Part 2 of the interview, Lotte and Max Giesinger discuss the variety of experiences they've had as performers, how hard it can be to get discovered, and some of the worst gigs they've ever played.

After a second wallet is stolen, everyone becomes even more suspicious of Nina. Max is still convinced that she didn't steal anything, and while he and Emma are in math class, Henri stands watch outside the gym.

Oliver Welke, Germany's answer to John Oliver or Trevor Noah, looks at ways in which some of the regulations put into place during the COVID-19 crisis are now being relaxed. Masks are still recommended, though Welke wonders to what extent people are using them effectively.

Nico and Sebastian are in the middle of moving a heavy piece of furniture when Inge shows up and starts going on and on about her upcoming trip.

The German federal state of North Rhine-Westphalia has the biggest COVID-19 outbreak in Germany, and is therefore introducing stricter measures to ensure social distancing. Among other penalties, restaurants that stay open will have to pay up to 4000 euros in fines, while individuals who meet in groups will have to pay 200 euros.

Yabla is an efficient and entertaining way to learn a new language! Learn about its features in this video.

Nico moves into Sebastian, Nina, and Lisa's shared apartment. He's actually collected quite a lot of stuff during his short time in Germany! Meanwhile, Sebastian asks Lisa to help him with a photo project.

When it becomes clear that his nephew Henri can't stay on his boat, Jan brings him to Emma's father, Hannes. Emma, however, is not happy to find that a guest has taken over her space in the attic – which also serves as the Peppercorn headquarters.

Gabriela and Mira from Karlsruhe talk about SINGinKA, the local choir project they founded. Their group doesn't have the same structure as most choirs – and is therefore much more open to all types of singing enthusiasts!

Jan Böhmermann and the panel discuss to what extent people really live in "filter bubbles" in which they only hear political perspectives that reinforce their own ideas. He thinks it's not as big of a threat as people believe.

We don't know exactly how and when life began on Earth, but the answer probably lies in the depths of the ocean: It is here that the first unicellular organisms evolved.

LOTTE and Max Giesinger talk about their new single, "Auf das, was da noch kommt" and how much fun they had shooting the music video with so many celebrity guests in hilarious roles.

"Alles nur geklaut," one of the earliest hits by German pop band Die Prinzen (The Princes), is a humorous reflection on how an artist's work may not always be original, and how that can affect a relationship. The German verb "klauen" is slang for "to steal."

"Dein ist mein ganzes Herz" ("My Whole Heart Is Yours") is a 1985 song by German rock singer Heinz Rudolf Kunze. In this video it is sung by SINGinKA, a chorus based in Karlsruhe.