One lucky sperm has made it into the egg – now the chromosomes from the sperm and the egg can start to link up.

Cell division is now in full swing, and inside the embryo, the organs are being formed! All the cells now have to reach the places where they are needed.

The formation of the embryo is in full swing, and the cells are working diligently to create all of the different body parts!

More building blocks are needed to form the growing embryo — and the chromosome department is hard at work!

The last segment of this video focuses on gestation: Over the course of nine months, a single, fertilized egg becomes a baby!

This series (originally created in French) explains processes in the human body, and in particular those related to cells and reproduction. We begin with the origin of the first cell—the source of all life on Earth!

What is a cell made of, and how many of them are there in the human body? And what is the “primordial soup” from which all life on Earth emerged?

Red and white blood cells, fats, carbohydrates, and more! They are all anthropomorphized in this zany animated look at how human cells are formed.

The journey continues inside of the cell, where one of the operators take a few elements along on a tour of all of the different respiratory processes.

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.

A circus tent full of sustainability experts: This image was presented today to journalists in Frankfurt-Ginnheim, as 300 fourth graders from Frankfurt primary schools celebrated the graduation ceremony of the first Frankfurt "School Year of Sustainability" in the children's Zarakali Circus.

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

Two businessmen shake hands, have a meeting, and both fall ill the next day. What did they do wrong? According to this report, they should have kissed each other on the cheek instead of shaking hands! A doctor in Berlin also tells us about the effectiveness of herbal teas... Gesundheit! (video copyright dpa)

The wheel may not need reinventing, but a Japanese designer has made a very good argument for the umbrella. Not only is it designed not to get ruined in a strong wind, but it has a few other neat features too! (video copyright dpa)