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If riddles and puzzles pique your curiosity and start your mental juices running, you'll have no problem honing your intellect on this collection of stumpers in improve your brainpower. Just like keeping your muscles healthy through a good workout, researchers say that when it comes to the brain, you need to use it or lose it. In this amazing collection, you'll be sure to find more than 400 ways to keep your "Little Gray Cells" strong and fit.