David Feldman has yet another winner with this book. Personally I have loved his Imponderables books and this is the largest collection to date. What are Imponderables? Well, to be brief, they are the questions that everyone seems to ask at one time or another, but would not have the first idea where to find the answer. For example, why do weather thermometers use red mercury and medical thermometers use red mercury? Why are peanuts listed under the ingredients of plain M&Ms? Can one spider get stuck in the web of another one? While the questions are trivial this is not like traditional trivia. Among other things, my trivia books are always where I left them. People pick it up read a few and put it down. Then later they may pick it up again and read a few more. With this book I have a hard time keeping track of where the book is located. People pick it up read a few, can't put it down and take it with them to another room. By the couch, by the chair, in a bedroom, in the kitchen, in the bathroom, who knows where it ends up? Part of the fun is also being a child again. The questions are the same kind of things that children ask when they are innocent and not afraid to ask questions about anything. Get in touch with the child inside you and ask the questions that you wouldn't ask anymore as an adult.... Do Penguins have knees?