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Formal Logic is a study of inference with purely formal content. The first rules of formal logic were written over 2300 years ago by Aristotle and are still vital to many modern disciplines like Linguistics and Computer Science.
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Explore and discover the human body, an incredible machine, with Human Body. For children ages 8–12.


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Paella de Marisco (seafood paella) is the world's most popular paella recipe. It emerged in its modern version in Spain's Valencian region in the early 1800s. Prior to the 19th century, the ingredients for seafood paella varied greatly with the most unusual being eel.
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