Baseball is fun. Crossword puzzles are fun. Math and world history-also fun? These crossword puzzles mix clues about baseball with math and world history facts appropriate for students in grades 5 - 12. Who knew that the answer to the clue "One method of factoring is called the difference of two _____" would rely on a correct answer to "Which Chinese philosopher said 'Choose a job you love, and you will never have to work a day in your life?'" Where else can the correct answer to "When a curve ball is thrown, what kind of spin does the ball have?" be dependent upon the correct answer to "The Khmer Rouge ruled which country beginning in 1975?" Educational fun for students at home, on vacation and in the classroom