How does the catalytic converter work in the car and what is a genetic fingerprint Why do plants need green leaves and light to produce the essential oxygen we need On which principles are self-cleaning surfaces based and why are vitamins so healthy What are molecular machines and how can we solve the problem of our future energy supply Each of these questions has something to do with chemistry - a fascinating science for those who want to understand our environment. The topics of modern chemistry are extremely diverse. Today, chemistry is at the center of the natural sciences, the boundaries to other disciplines such as biology, physics, medicine and computer science are fluid.