As Bronowski says of Gregor Mendel's revolutionary paper on the genetics of the sweet pea plant, Mendel published his results in 1866 and achieved instant oblivion. What exactly did Mendel discover, and why was nobody interested at the time? Why do you think there was suddenly interest in his results when Mendel's law was rediscovered in 1900? Bronowski says that sexual reproduction is responsible for diversity. What does this have to do with Mendel's law of heredity, and how is genetic inheritance in turn related to the work of Darwin and, ultimately, to that of Watson and Crick?