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Joseph Priestley
Joseph Priestley (; – 6 February 1804) was an 18th-century English theologian, dissenting clergyman, natural philosopherchemist, educator, and Liberal political theorist who published over 150 works. He is usually credited with the discovery of oxygen, having isolated it in its gaseous state, although Carl Wilhelm Scheele and Antoine Lavoisier also have a claim to the discovery.

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