A senior and well-published scientist describes, through anecdotes, parables, and stories how scientists conceive, ask, and answer questions, and how what they do develops from the culture of their time. Part 1 describes the origins of modern biological science. It addresses issues such as why the story of evolution arose in the 19th C, and not before or after, how the evidence was gathered, and how its misuse led to some terrible decisions by societies. Part 2 describes the rules for experimental science, what constitutes a good versus a poor experiment, how hypotheses, such as the hypothesis or the origin of AIDS, are tested and evaluated. The author goes on to describe the origins of molecular biology and the "cool tricks" that created a billionfold greater ability to analyze living things, leading to the miraculous capabilities that we have today.