The Centers for Disease Control and Prevention says Americans today have lower levels of potentially dangerous substances in their blood than ten years ago.

Such substances include lead and byproducts of secondhand smoke

A mother was charged with two counts of murder in the beating deaths of her two sons. Police say Magdalena Lopez, 30, beat the boys with a 10-pound dumbbell because she believed they would be better off in heaven.

Lopez was arrested Tuesday night after police responded to her 911 call and found 9-year-old Antonio Lopez and 2-year-old Erik Lopez dead in separate rooms of their home

The Centers for Disease Control and Prevention says Americans today have lower levels of potentially dangerous substances in their blood than ten years ago.

Such substances include lead and byproducts of secondhand smoke

A mother was charged with two counts of murder in the beating deaths of her two sons. Police say Magdalena Lopez, 30, beat the boys with a 10-pound dumbbell because she believed they would be better off in heaven.

Lopez was arrested Tuesday night after police responded to her 911 call and found 9-year-old Antonio Lopez and 2-year-old Erik Lopez dead in separate rooms of their home

According to the Centers for Disease Control and Prevention, Americans today have lower levels of potentially dangerous substances in their blood than those 10 years ago.

Such substances include lead and byproducts of secondhand smoke