How did a Dutch prime minister’s 1973 decision to ban cars every Sunday accidentally turn a whole country into the world’s cycling capital within a decade?July 28, 2026
When a lightning return stroke heats a channel only centimetres wide to roughly 30,000 kelvin, about five times the temperature of the Sun’s visible surface, the air expands so violently that the pressure wave rolls across the ground as thunder Saving Tips July 28, 2026 A cloud-to-ground lightning return stroke can heat the air inside its narrow channel to roughly 30,000 kelvin, more than five…
