Paperback. Good used condition. Some cover wear. Corner wear. Spots on side of pages. By James Trefil. From the publisher: “Addresses questions such as: How id wings evolve; What do rocks tell us about the earth's shifting magnetic field; How did Louis Pasteur disprove spontaneous generation; Why did English moths turn gray during the industrial revolution; why is silk flexible; why will there never be a hurricane in Kansas and many more”