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.

Here's a flashback to when Frankfurt Airport was buzzing with activity. The airport opened its doors in celebration of Mother's Day, offering special activities and prizes. Despite strikes at the time, the transportation industry was doing quite well.

Henri and Emma finally chase down the thief – and prove that Nina didn't steal any of the wallets.

After the Peppercorns wrap up the case of the stolen wallets, Max sets off on his bike to his grandmother's food truck – and has an unfortunate encounter along the way.

You may know the story of "The Tortoise and the Hare," but do you know about the race between the hare and the hedgehog?

Could you point to the Rhineland on a map of Germany? Since when has the area officially been Rhineland-Palatinate? And why do tourists flock to it? In this video, you can learn all about the geography, demographics, and landscape of this federal state.

Emma is determined to help Max, who is being blackmailed by a drug dealer. Nina continues to claim that she doesn't need any friends and doesn't want to join the Peppercorns. Meanwhile, a student has a bad reaction to the happy pills...

For the rabbit, winning is all that matters, to the extent that he compromises his own safety! Meanwhile, the hedgehog is taking things extremely slowly, perhaps having forgotten about the race altogether.

Spring has sprung in Germany, with warm temperatures in almost all regions – and a lack of rain that is actually problematic for the environment.

Cologne-based band AnnenMayKantereit — best-known for the distinctive raspy vocals of lead singer Henning May – performs a song about the pain of returning a former partner’s belongings to them following a breakup.

After Anna is taken to the hospital, Nina goes to find Emma, only to learn that Emma's in Sankt Pauli trying to trace the origins of the drugs.

After the hare is freed from the trap by a benevolent old man, he continues on with the race despite his injured leg — but he can't escape the fear that he might have lost. Meanwhile, the hedgehog and his wife are having a beautiful day on the lake.

Having broken into Dragan's place, Emma and Nina learn that he is using their classmates to push drugs at their school and others. Suddenly, the dealers come back to their hideout – and the girls are trapped!

How has the coronavirus outbreak changed life in Germany? Cettina gives a short overview of the various developments that have taken place over the past few months, and how she and her family are coping.

If the drug dealer Dragan finds out that the Peppercorns are on his trail, he’ll surely make trouble for them. Fortunately, Emma, Nina, and Max are able hatch a plan to get Dragan arrested before it's too late.