At the threshold where living matter meets engineered material, a team at Argonne National Laboratory has coaxed sunlight, air, and water into producing hydrogen peroxide with a quiet efficiency that industrial chemistry has long struggled to achieve. By marrying a synthetic semiconductor with a light-harvesting membrane borrowed from ancient salt-dwelling microorganisms, researchers have assembled a nanosheet so thin it defies easy imagination — and yet capable of outperforming conventional materials fivefold. The achievement asks a deeper question humanity has circled for generations: what b