Through case studies of scientists in the Amazon analyzing soil and in Pasteur’s lab studying the fermentation of lactic acid, Latour shows us the myriad steps by which events in the material world are transformed into items of scientific knowledge. ``Do You Believe in Reality?'' News from the Trenches of the Science Wars 1(23) Circulating Reference Sampling the Soil in the Amazon Forest 24(56) Science's Blood Flow An Example from Joliot's Scientific Intelligence 80(33) From Fabrication to Reality Pasteur and His Lactic Acid Ferment 113(32) The Historicity of Things Where Were Microbes before Pasteur? 145(29) A Collective of Humans and Nonhumans Following Daedalus's Labyrinth 174(42) The Invention of the Science Wars The Settlement of Socrates and Callicles 216(20) A Politics Freed from Science The Body Cosmopolitic 236(30) The Slight Surprise of Action Facts, Fetishes, Factishes 266(27) Conclusion What Contrivance Will Free Pandora's Hope? 293(10) Glossary 303(9) Bibliography 312(5) Index 317