"Alarmed by chronic problems with lead-contaminated water in downstate Galesburg, federal officials are urging local officials to provide bottled water or filters to residents where testing at household taps found high levels of the toxic metal. Though the small Knox County city stands out for repeatedly exceeding U.S. Environmental Protection Agency lead standards, a Tribune analysis of state data has identified about 170 other public water systems in Illinois — serving about 700,000 people in all — where test results exceeded federal standards during at least one year since 2004."

"Just outside Pearland, theater patrons come and go within 200 feet of a warehouse that stockpiles a pesticide so toxic it seeped into a family’s house in Utah and killed two little girls."

"West Nile. Dengue. Chikungunya. In recent years, this trio of potentially deadly mosquito-borne viruses carved out a definite niche in the growing catalogue of American anxieties."

"Top Senate negotiators announced agreement Thursday on a $1.1 billion emergency funding measure to battle the Zika virus. That’s less than President Barack Obama’s $1.9 billion request, which has upset some senior Democrats."

"Experiments using lab mice show how the Zika virus travels through the bloodstream, multiplies in the placenta and invades the brain of the developing fetus, stunting growth or causing death, researchers said Wednesday."

"The White House and Democrats are pressuring congressional Republicans to act on President Barack Obama's demands for money to combat Zika, but even the onset of mosquito season that probably will spread the virus has failed to create a sense of urgency."

"The evidence linking pesticide exposure to childhood cancers and learning and behavioral problems has grown increasingly strong."

"Pregnant women who’ve traveled to Latin America and the Caribbean are advised to be tested for the Zika virus afterward. But medical researchers have discovered there’s a problem with that advice: Some diagnostic tests will return positive results even when a person hasn’t contracted Zika."

"The two leading senators working to reform the country’s 40-year-old toxic chemicals law say they’ve come to an initial agreement on how to move forward."

"Young starfish are staging a comeback in Oregon and Northern California, after a virus that melts the animal devastated adult populations along the northern West Coast starting in 2013."