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" ... Chemical engineer Thomas Midgley, during his research for General Motors, discovered that adding chemical called tetraethyl lead to gasoline could improve fuel efficiency and prevent engine knocking. Tetraethyl lead became a common fuel additive for most of the 20th century, until regulators realized that cars running on leaded gasoline were pumping fine particles of lead into the air and causing environmental damage and health problems. Most countries banned leaded gasoline in the 1990s or early 2000s. ... "