For 10 points, name this highly poisonous gasoline additive once used to raise octane levels and prevent engine knocking.
First discovered by Thomas Midgely at General Motors in 1921, its extreme toxicity led to dozens of deaths among researchers and production workers. Nevertheless, GM and DuPont began to market it in 1924, and its use soon became so widespread that old cars have difficulty functioning without it. Although its sale was phased out in the U.S. beginning in 1976 after an EPA lawsuit, it was sold in China until 2001 and is still available in some European countries. For 10 points, name this highly poisonous gasoline additive once used to raise octane levels and prevent engine knocking.
First discovered by Thomas Midgely at General Motors in 1921, its extreme toxicity led to dozens of deaths among researchers and production workers.
{tetraethyl lead} [prompt on lead]