Rachel Carson’s 1962 book, Silent Spring, shook the nation and helped launch the modern environmental movement. But before the book came out, Carson was already making her case in Silver Spring, Maryland. When a local homeowners' association asked her to speak about pesticide use in the neighborhood, she abandoned her prepared remarks and spoke instead about the link between chemicals and cancer. It was, in Carson’s estimation, “a fair little test of the reception that may be given the book.”