Hey kids--are you ready to train your brains? This series of fun books will really let kids give their brains a workout Designed by a puzzle-book pro and the creator of the online brain-training site Brained Up ( www.brainedup.com ), these brain-teasing books are brimming with mind-scrambling puzzles that have been scrutinized and approved by British Mensa. In Perplexing Puzzles, kids will find almost 100 pages of number stumpers, visual teasers,...