TechnologyTiny discs can levitate in the upper atmosphere using sunlight alone A physics phenomenon discovered 150 years ago allows tiny objects to levitate using just sunlight – and now it could enable swarms of sensors to explore part of Earth’s long-neglected upper atmosphere News
EnvironmentModern fuel-efficient jets can cause more warming than older planes Passenger planes and private jets that fly higher can create longer-lasting contrails, meaning their contribution to global warming has been underestimated News