Reading this story requires you to willfully pay attention to the sentences and to tune out nearby conversations, the radio and other distractions. But if a fire alarm sounded, your attention would be involuntarily snatched away from the story to the blaring sound.

In the March issue of BioScience, researchers present a sophisticated new analysis of the effects of boosting use of maize-derived ethanol on greenhouse gas emissions. The study, conducted by Thomas W. Hertel of Purdue University and five co-authors, focuses on how mandated increases in production of the biofuel in the United States will trigger land-use changes domestically and elsewhere. In response to the increased demand for maize, farmers convert additional land to crops, and this conversion can boost carbon dioxide emissions.

In the far northern reaches of the Arctic, day versus night often doesn't mean a whole lot. During parts of the year, the sun does not set; at other times, it's just the opposite. A new study reported online on March 11th in Current Biology, a Cell Press publication, shows that Arctic reindeer have come up with a solution to living under those extreme conditions: They've abandoned use of the internal clock that drives the daily biological rhythms in other organisms.

Early detection is key to more effective treatment for Alzheimer's disease and other forms of cognitive impairment, and new research shows that a test developed at the University of Tennessee is more than 95 percent effective in detecting cognitive abnormalities associated with these diseases.

A research team led by the University of Colorado at Boulder has discovered a previously unknown cellular "switch" that may provide researchers with a new means of triggering programmed cell death, findings with implications for treating cancer.

When cells move about in the body, they follow a complex pattern similar to that which amoebae and bacteria use when searching for food, a team of Vanderbilt researchers have found.