At concentrations currently found in water, the widely used weed killer atrazine hormonally strips male frogs of their masculinity and may be partly responsible for global amphibian declines. (p. 243)

A controversial new statistical model concludes that the common ancestor of primates lived 81.5 million years ago, about 16 million years earlier than many paleontologists have estimated. (p. 243)

New measurements reveal that some of the earliest galaxies in the universe produced winds so powerful and persistent that they blew material from one galaxy to another, temporarily separating dark matter from visible matter and profoundly influencing the evolution of future generations of galaxies. (p. 244)

Of people who died suddenly, those who succumbed to a heart attack had an abundance of the inflammation indicator C-reactive protein in the blood, even though few had had outward signs of heart problems. (p. 244)

European researchers have documented the largest ant supercolony yet, a network of cooperating nests that stretches from Italy to the Atlantic. (p. 245)

A novel modification to polymer membranes gives researchers a means to tune certain filters so they separate molecules more quickly and more selectively. (p. 245)

Researchers report a strong relationship between eye size and the light intensity at which birds start to sing in the morning. (p. 245)

Two stellar corpses thought to be made of neutrons may actually contain weird forms of matter never observed before. (p. 246)

From anecdotal reports of little-studied phenomena, researchers suspect that artificial night lighting disrupts the physiology and behavior of nocturnal animals. (p. 248)

The technique of studying animals through genetic analysis of their fur gained fame with a political furor over lynx, but scientists have applied the technique to many other animals. (p. 250)

According to a 16-year study of nearly 90,000 women, the vitamin folate has a protective effect against colon cancer among women whose families have been affected by the disease. (p. 253)

New measurements of the movement of the Antarctic ice sheet across a lake that harbors microbial life beneath 4 kilometers of ice could help scientists determine where to drill to get the freshest samples of frozen water without contaminating the lake. (p. 253)

The male lions of Tsavo National Park don't grow manes but they're no wimps—they're the only male lions found so far that rule big prides of females alone, without help from some buddies. (p. 253)

Two large studies find little evidence that antibiotics can protect some people with cardiovascular disease against subsequent heart attacks. (p. 253)

The herbal remedy St. John's wort can interfere with the effectiveness of the anticancer drug irinotecan. (p. 254)

A protein fragment dubbed NK4 can stall the development of pancreatic cancer in mice. (p. 254)

Scientists have identified a gene, dubbed LKB1/STK11, that is often mutated in people with a particularly deadly form of lung cancer. (p. 254)

A drug prescribed for a condition called dry mouth stymies formation of precancerous lung lesions in cigarette smokers. (p. 254)