We know that cities use machines to clean the streets, but did you know that specially-designed sidewalks can clean the air we breathe? Learn about the new way that the city of Frankfurt is working to improve the environment in this fascinating report from Rhein-Main TV. Umweltverschmutzung? Nein danke!

"There are inventions that were made and later forgotten, and there are inventions that somebody forgot to invent." Walter Günther from Frankfurt/Main has done some catching up. He makes devices, which look as if they are from a museum, but which in reality never existed! (Copyright DPA)

Walter Günther is a throwback from a by-gone day! This Frankfurt tinkerer/inventor gives us a glimpse of his 19th century metal workshop. Take a look for yourself and see, for example, a completely automated grill that browns sausages evenly and his whimsical "Schaumkusswurfmaschine". [lit. "foam-kiss throwing machine"] Viel Spaß wünsche ich euch dabei!

An interesting discussion from the field of astronomy: Considered minor planets, asteroids are categorized according to their orbits. Also, contrary to sensationalistic Hollywood’s film portrayals, the probability of them posing a danger to planet Earth in the short-run is slight. To the science enthusiasts among our subscribers, enjoy! A documentary by WissensMagazin.

The desire to be able to see further and further out into space is made possible by an amazingly large telescope in the Ataca wilderness in the northern part of Chile. It is aptly called VLT ("very large telescope") and gives us a glimpse into the cosmic past. Enjoy this journey back in time! A documentary by WissensMagazin.

The Sun is the dominant orb in our planetary system. According to researchers, its light will extinguish in 4 billion years. Enough time for a couple more sunbaths. A documentary by WissensMagazin.

In this clip by Mathematik.net, a magnetic levitation train in a vacuum tube is used to illustrate Newton’s First Law.

Who still remembers Newton’s First Law? Nobody? Well, then this clip by Mathematik.net is exactly right for you. Have fun brushing up on your physics (and language skills at the same time) while watching this video.