Tucson’s skies are slightly darker thanks to the completed streetlight conversion project, according to a study by the Tucson-based International Dark-Sky Association. The study, however, was limited ...

Across the country, drivers who swapped their factory halogen bulbs for bright white LEDs are discovering an unwelcome side ...

Biofilms are clusters of microorganisms that stick to non-biological surfaces, such as rocks in a stream, as well as to surfaces on plants (roots) or in animals (epithelium). These clusters are often ...