Every day we make conscious decisions: to buy a sofa, go for a jog, or share a smile. Some scientists have already placed the so-called free will on the list of endangered illusions. What do researchers and philosophers understand by free will? Can its existence or non-existence be proven in a laboratory experiment? Do unconscious processes in the brain control our behavior? The author summarizes assumptions and research findings from neuroscience in an accessible manner and explains the various positions in philosophy. What implications do these insights have for human coexistence, the legal system, and more? This is an equally entertaining and well-founded introduction to the dizzying contemplation of whether and what we can truly want.