"Open train cars filled with sand have raised alarm in St. Paul's St. Anthony Park neighborhood, where some residents wonder if the silica that comprises 80 percent of the unprocessed sand is safe."

"Two recent documents are drawing renewed attention to the federal government's wildlife damage control program."

"NASHVILLE, Tenn. -- Laboring in the blackberry fields of central Arkansas, the 18-year-old Mexican immigrant suddenly turned ill. Her nose began to bleed, her skin developed a rash, and she vomited."

"Too contaminated to drink and never in continuous supply because of the hours-long daily power shortages, the water in Gaza is causing widespread, chronic health problems and contributing to high rates of child mortality."

"Amid debate over the safety of publishing such research, a study in Science outlines how lab teams engineered the contagious strains of H5N1, and concludes that the deadly virus could cause a global pandemic."

"A bioactive chemical cousin of BPA turns up on money and in receipts"

"For a century, doctors have waged war against bacteria, using antibiotics as their weapons. But that relationship is changing as scientists become more familiar with the 100 trillion microbes that call us home — collectively known as the microbiome."

"Gov. Jerry Brown urged state regulators Monday to reduce the prevalence of chemical flame retardants in household furniture, joining a growing number of critics who argue the chemicals are toxic and unnecessary."