Lead from gasoline blunted the IQ of about half the U.S. population, study says
Leaded gas was banned in 1996, but exposure to the poison cost people born before then several IQ points on average, researchers estimated.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction: Lead from gasoline blunted the IQ of about half the U.S. population, study says

### Response: Leaded gas was banned in 1996, but exposure to the poison cost people born before then several IQ points on average, researchers estimated.