FDA researchers report that multiple active ingredients wind up in users’ bloodstream and recommend toxicology testing to investigate the clinical significance of the findings.

Researchers have outfitted brewer’s yeast with light-harvesting semiconductors to boost chemical productivity.

Moderate ultraviolet light exposure boosts the brainpower of mice thanks to increased production of the neurotransmitter glutamate.  

Optometrist and eclipse-chaser Ralph Chou describes how even a partially eclipsed sun can damage the eye.

A new study reports which types of corals make the most of the sunlight they receive. 

A new nanoparticle-based sunblock is effective, long-lasting, and may eliminate absorption of potentially harmful chemicals into the skin and bloodstream, a mouse study shows.

UVA exposure reduces human blood pressure by releasing nitric oxide metabolites from storage in the skin.

Shortly after demonstrating dung beetles’ ability to navigate by the stars, researchers in Sweden provide evidence that the insects can also use the sun to find their way.

Humans’ circadian clocks become skewed when they are exposed to electric lights but revert to a schedule more in tune with the sun when they go camping.