These fascinating books are filled with hundreds of amazing science facts and puzzles, all based on real-world scientific principles. Why do cats' eyes glow green? Why does a boomerang come back? How big would the world be if all the empty space was squeezed out of it? Can you build a time machine? Learn why the size of the moon appears to change, the probability that any two children are girls, and what noise ice cubes make if you drop them into hot soup. The answer to each problem explains a scientific or mathematical principle in easy-to-understand terms, so not only are you solving puzzles, you are learning the secrets behind the most puzzling mysteries of the universe. 144 pages per book.
Age Recommendation: Ages 10 and up