A researcher? But what exactly are you looking for, Mr. Douzou? To this question, Pierre Douzou, a member of the Académie des Sciences and a professor at the French national museum of natural history, gives his answer. Using a humourous, grave, and often caustic tone, he presents here the important names in molecular biology, explains what is the Pasteur Institute, the Curie Institute, and recounts the habits, quarrels, victories which exist in these mythical places where science is made.