One thing one can hardly fail to notice about life is that it is self-perpetuating. Palaeontology tells us that life has been perpetuating itself for billions of years. What is the secret of this stunning success? Through natural selection, life forms adapt to their environment, and in the process they acquire, one might say they become, knowledge about that environment, the world in which they live and of which they are part. As Konrad Lorenz put it, “Life itself is a process of acquiring knowledge.” According to this interpretation of evolution, the very essence of life (its meaning?) is the pursuit of knowledge: knowledge about the real world that is constantly tested against that world. What works and is in that sense ‘true’, is perpetuated. Life is tried and proven knowledge that has withstood the test of geological time. From this perspective, adopting the pursuit of knowledge as a possible meaning of one’s life seems, literally, a natural choice. The history of science and philosophy is full of examples of people who have done just that, and in doing so they have helped human beings to earn the self-given title of Homo sapiens – man of knowledge.