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Citing growing evidence that no amount of lead exposure is safe for kids, the American Academy of Pediatrics has called for tighter regulations on the amount of lead in house dust, water and soil.

Gun control has become a major subject of debate in the Connecticut Democratic presidential primary.

The warm, wet summer months in Puerto Rico are the perfect breeding time for the mosquitoes that carry Zika virus. As the mosquitoes multiply there, so do the human cases of infection.

The country's Human Rights Commission accuses federal security forces of nearly two dozen extrajudicial killings during a raid in Michoacan last year. Police are said to have attempted a cover-up.

At least 27 people were injured in the shooting. Police now believe there was only one shooter, an 18-year-old German-Iranian man, born and raised in Munich.

At least nine people were killed Friday after a shooting near a shopping center in Munich, Germany. Police say they are searching for as many as three shooters.

A study finds that the Anopheles arabiensis species of mosquitoes, a major carrier of malaria in sub-Saharan Africa, is repelled by the smell of chicken.

A Baltimore court has acquitted Officer Caesar Goodson of second-degree murder in a case related to the death of Freddie Gray. Goodson drove the van that transported Gray.

A theme park featuring a life-size Noah's Ark opens this week in Kentucky. Its creator calls it a "world-class attraction." Critics say it reinforces the state's anti-science image.

What Washington, D.C., did — closing its Metrorail for 29 hours — sets it apart. Meanwhile, the developing world turns out to be developing some attractive transit options.