Surprising amount and variety of gamma radiation is produced in large tropical thunderstorms, observations reveal Phys.orgMysterious form of high-energy radiation spotted in thunderstorms Nature.comVia NASA Plane, Scientists Find New Gamma-ray Emission in Storm Clouds Science@NASASpy plane observes how storms produce radioactive clouds and antimatter EL PAÍS USANASA’s U-2 spy plane found gamma rays in 90% of lightning storms Popular Science