A first-of-its-kind study found lead, arsenic and other heavy metals in various tampon brands, but didn't link them to harmful health effects. Experts explain why it matters — and what to watch for.
The 1984 gas leak in Bhopal, India, killed thousands. New research finds babies born to mothers who were pregnant at the time have suffered long-term impacts worse than those directly exposed.
A portion of the main freeway that links the state's two largest cities remains closed outside Tucson a day after a deadly crash caused a hazardous material leak and forced evacuations nearby.
