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Sometimes fun factoids and randomly learned trivia stick to our brains and help us shout the answers during Jeopardy! Let your grandkids in on your secret to being so worldly: Fat Brain Toys' "Learning Calendar” gives them a bite-size lesson in history, world cultures or art for each day of the year. Daily blurbs include everything from Louis Pasteur's birthday, World War II milestones and recent stuff like Russia and China's 2005 joint military drills. Seventeen months of such varied info about this mad, mad world is enough to give your grandchild an existential crisis, but they usually whine to their parents about that sort of thing. You can just have fun battling them for daily doubles.