"It's not the kind of crime that's likely to appear on CSI. But counterfeit vehicle-inspection stickers that end up in Dallas County have links to deadly drug gangs in Mexico and human smuggling. They contribute to health-threatening pollution problems that also constrain business development in North Texas."

"People who spend their evenings in relatively bright light run the risk of stressing their bodies by ratcheting down the production of melatonin. Produced in the brain's pineal gland, this hormone plays a pivotal role in setting the body's biological clock – and, potentially, in limiting the development of certain cancers."

"More than 30 years after Congress set a goal of clearing the pollution-caused haze that obscures scenic vistas at some of America's wildest and most famous natural places, progress is still slow in coming."

"A Cold War 'red scare' campaign against compulsory medication helped kill off five years of fluoridation in this northern Wyoming city in 1954. The federal government has long since called fluoridation one of the greatest public health achievements of the 20th century. But it was only a few weeks ago that Sheridan's City Council voted to resume fluoridating municipal drinking water."

"Legally required water systems at Massey Energy's Upper Big Branch coal mine in West Virginia were not functioning properly before the April 5 explosion that killed 29 mineworkers, according to multiple sources familiar with the disaster investigation."