The microscope opens doors to micro-worlds that remain hidden from the naked eye. Thanks to this brilliant invention, we are learning more and more about the building blocks of our lives and the exciting world around us. Just think of all that can be discovered in a tiny drop of water! A water flea zips around. The paramecium makes its way through dense strands of algae. Creepy creatures and breathtaking beauties - welcome to the world of the microcosm! In science and research, for example in medicine and forensics, the microscope is indispensable. What is What embarks on an excursion: Who invented the microscope? How does it work? Where exactly is it used? Great photos, infographics, and tips for your own experiments included.