It is not surprising that when doctors examined people who had worked at a lead smelter for years, they found no lack of neurological problems associated with lead.

But not every worker was affected equally, a new study says, especially when it came to those who were good readers. While those workers had the same sorts of motor skill losses as their colleagues, they had retained much more of their thinking skills.

People who are good readers, generally a sign of better education, have been found in earlier studies to have better health. The presumption has been that this is because they can take better care of themselves or afford better food, housing and medical care.

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