Discover our introduction to the science of timekeeping. We love watches for many reasons, but the timepiece's main mission is to keep time. Before they became items to appreciate and wear, watches and clocks were scientific instruments that allowed humankind to conquer the world, particularly at sea. Of course, technology brought many improvements, in particular the introduction of electronic mechanisms. But these don't have the same appeal that mechanical ones do -- by far. So come with us and follow our saga of 5 episodes that begin with this question: what does it really mean to measure time?