Gr 4-7Guess Again, a sequel to Weird and Wacky Inventions (Crown, 1978), uses a lighthearted multiple-choice quiz to introduce more unusual inventions, such as a coffin with an escape hatch and training pants for dogs. A descriptive paragraph is accompanied by a pen-and-ink drawing, based on the original patent drawings. Readers are then given three or four possible choices of the invention's purpose; on the next page, along with the correct answer, is more information about the invention. Because the act of invention to fulfill a need is an important ingredient of the American spirit, the first and last chapter tell the stories behind other inventions that were more ``needed'' than those in the main body of the book. The afterword tells a little about the patent process. The game-like format and sometimes absurd inventions will hold readers' attention. Margaret M. Hagel, formerly at Ryan Upper School Library, Norfolk, Va.