A newly discovered compound from hot-spring cyanobacteria naturally blocks UV radiation and neutralizes harmful free radicals. Its unusual structure and stress-triggered production could pave the way for safer, greener sunscreens. Credit: Shutterstock Natural sunscreens protect the skin from damaging radiation while reducing the risk of allergic reactions. In a recent study, researchers identified a previously unknown compound called β-glucose-bound hydroxy mycosporine-sarcosine. This substance