He settled in Pennsylvania, where he continued his research until his death. His unorthodox religious writings and his support for the American and French revolutions so enraged his countrymen that he was forced to flee England in 1794. He invented carbonated water and the rubber eraser, identified a dozen key chemical compounds, and wrote an important early paper about electricity. Priestley (1733-1804) was hugely productive in research and widely notorious in philosophy. It might have endured even longer had it not been for a free-thinking English chemist and maverick theologian named Joseph Priestley. But it made excellent sense at the time, and there was so little reason to dispute it that the idea persisted until the late 18th century. That notion may seem charmingly primitive now. Some 2,500 years ago, the ancient Greeks identified air - along with earth, fire and water - as one of the four elemental components of creation.
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