"People with high levels of exposure to the banned insecticide DDT were four times more likely to have Alzheimer’s disease than people with low levels, according to a study of patients in Georgia and Texas published today. The research is among the first to report a connection between Alzheimer’s, which is the world’s most common neurodegenerative disease, and chemicals in the environment."

"EUNICE, N.M. — While the only American-owned company that enriches uranium prepares for bankruptcy, its competitor is zooming ahead with construction of what it describes as a cluster of far more economical and efficient new centrifuges."

"With their quaint barrel-like contours and weathered cedar-plank sides, rooftop water towers are a constant on the New York City skyline. And though they may look like relics of a past age, millions of residents get their drinking water from the tanks every day."

"WASHINGTON — From climate change to natural gas, energy issues have figured prominently in all of President Barack Obama’s annual State of the Union addresses. Expect the same on Tuesday night, when Obama goes before a joint session of Congress and a nationally televised audience to deliver his assessment of the United States’ health and pitch his policy priorities for the nation."