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Freerice donates ten grains of rice to the hungry for every correct answer. The site now features quizzes ranging from knowing the multiplication facts to identifying famous paintings. Best known for their vocabulary questions (featured on the home page), Freerice also has this feature available in other languages, including French and Spanish. The section on chemical symbols would be a great way to study for that inevitable Chemistry quiz - and do a little good for others at the same time.