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Food stamp (SNAP) rolls increased over the years, and the article addresses that this is a sign of poverty.  The USDA is an agency that administers food stamps.

The Supplemental Nutrition Assistance Program (SNAP) and Women, Infants, and Children (WIC) are two agencies that many low-income families are enrolled in.  WIC provides nutritious food for pregnant, breastfeeding and postpartum women, infants and children up to the age of five; it is specifically available for household up to 185 percent of the federal poverty lines.  SNAP provides low-income families with nutritious food.

This study determines if childhood blood lead levels correlate with educational achievement.  They studied this through standardized test scores.