A few nasty viruses have managed to gain entry into the cells. But the white blood cells can handle them!

In this final segment detailing the goings-on within a human cell, we learn about what happens when there’s a skin injury.

This entry in the “explainity” short video series lays out the concept of sustainability and its three pillars: environmental, social, and economic.

Everyone knows the brand Mercedes-Benz, but not many know much about the founder. This video series tells the story of the automobile from the very beginning, and in particular, the life story of Carl Benz.

When Carl Benz first introduced his invention, people were anything but enthusiastic. In fact, many were terrified of the strange, spluttering contraption.

From the German constitution to Fasching... If you want to become a naturalized citizen, you have to prove a lot - including a sound knowledge of German culture. You can find the current requirements in this video.

These days, a lot of people are paying attention to their carbon footprint. Drinking straws are no longer made of plastic, toothbrushes are made of wood, and we're happy to forego that domestic flight to Munich for a long weekend—all for the sake of the environment. But there's one person who doesn't care: Felix, a rabbit from a children's TV series.

Jannika from "ZDF Magazin Royale" has to give Felix the Rabbit a piece of her mind. All of his traveling is no longer sustainable given its impact on climate change!

From Brussels to Barcelona in just 30 minutes? The dream could soon become reality! Come along on a high-speed trip to the Netherlands and learn more about the futuristic vision of a Europe-wide Hyperloop transport network.

Bjørn Dunkerbeck is the greatest legend windsurfing has ever produced—surpassing even his long-time rival and now friend, Robby Naish. RTL reporter Laura Pröscholdt went to visit him and his family on Gran Canaria and learned: Windsurfing keeps you young!

In this part we learn more about Björn's family and what influence they had on his career as a professional windsurfer.

This part is about how windsurfing has changed throughout the years. Björn Dunkerbeck talks about new sports, his own goals, and why today it's mainly his sons who compete in the harsh conditions.

The first segment introduces us to the main characters who, aboard the train from Munich to East Berlin on August 13, 1961, will face a difficult decision: freedom or home.

August 13, 1961: A fateful message reaches the train bound for East Berlin: The construction of the Wall has begun. The passengers now have three and a half hours to decide—home or freedom?

As the train continues its course towards Berlin, the band of musicians perform a song about yearning for freedom, which contrasts with the security checks of East Germans returning from the West.