"For the public officials who safeguard Milwaukee's water, Cryptosporidium changed everything."

"With smoke and tar from faulty light fixtures leaking into New York City public school classrooms at alarming rates, the Bloomberg administration said on Tuesday that it would cut in half the time it needed to replace them."

"For the fourth time since 1956, Portlanders on Tuesday night rejected a plan to fluoridate city water, 60 percent to 40 percent."

"A growing body of mortality research on immigrants has shown that the longer they live in this country, the worse their rates of heart disease, high blood pressure and diabetes. And while their American-born children may have more money, they tend to live shorter lives than the parents."

"Residents of Manhattan will not just sweat harder from rising temperatures in the future, says a new study; many may die."

"I can tell you the exact date that I began to think of myself in the first-person plural — as a superorganism, that is, rather than a plain old individual human being."

"Experts say Wisconsin lakes’ chemical cocktail likely similar to Minnesota's"

"JACKSONVILLE, N.C. -- As she flipped through the cemetery register, Mary Blakely's eyes filled with tears. On line after line, the entry read simply 'Baby Boy' or 'Baby Girl,' followed by a surname and a burial date."

"Updated federal advice on mercury levels in fish appears to have stalled within the U.S. department of health, frustrating scientists and advocacy groups who argue that exposure to mercury may be dangerous at lower levels than previously thought."

"Frogs that were imported for pregnancy tests and set loose in California carry a deadly fungus responsible for wiping out vast numbers of amphibians worldwide, scientists have found."