We fly to the moon and send research robots to Mars to discover unknown worlds. But even here on Earth, there is still much that is unknown.

Scientists estimate that there are 5 to 80 million animal species on our planet - but we only know about one million species. Scientists are constantly finding new creatures in the treetops of tropical forests or deep in the sea. The diversity is almost unimaginable. And of course we cannot know what functions all these plants and animals have - and what would happen if they became extinct.

In this lecture, we will embark on an exciting journey through nature and perhaps uncover a secret or two.

Photo: © Chris Rogers/istockphoto.de