1.   At low levels, mercury exposure can cause emotionally irritability and vision and hearing problems.

2.   Programs are under way to reduce mercury exposure there by encouraging consumption of fish species with lower mercury levels.

3.   Recent studies of the effects of low-level mercury exposure, primarily from eating contaminated fish, have produced differing results.

4.   The families of nine autistic children claim in lawsuits that mercury exposure from dental fillings, vaccine preservatives and power plants caused or worsened the disability.