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Encyclopædia Britannica, Inc.An explanation of the difference between a scientific hypothesis and a scientific theory.
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Encyclopædia Britannica, Inc.An introduction to the Brooklyn Bridge, its history and construction, and its place in the geography of New York City.
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International Children's Surgical Foundation (A Britannica Publishing Partner)Time-lapse video of a 2.5-hour surgery performed by doctors of the International Children's Surgical Foundation. (Video contains graphic surgical footage.)
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© American Chemical Society (A Britannica Publishing Partner)How anesthesia works.
