Rising concern about possible environmental damage from the active ingredients in sunscreens could have ripple effects on public health if it causes people to use less of them.

UV lights come in a variety of different wavelengths, but not all are equally effective at disinfection. Researchers tested a number of commercially available lights to find the best.

New research shows how the Montreal Protocol protected vegetation, helping keep carbon out of the atmosphere.

Astronomers just measured the largest flare ever from Proxima Centauri, humanity's closest neighboring star. These flares could be bad news for life trying to develop on a planet orbiting the star.

Researchers are developing tattoo inks that do more than make pretty colors. Some can sense chemicals, temperature and UV radiation, setting the stage for tattoos that diagnose health problems.