Fourth of July

Today, as you all know, is a notable date. Seventy-three years ago Leo Szilard (real name Szilard Leo) patented the chain reaction method of nuclear reaction which made possible the atomic bomb. Yet they have banned fireworks in America. Inexplicable, isn't it?
He had had the idea while watching the traffic lights change in Southampton Row in Bloomsbury. I watched them change the other day, but I didn't think of anything very much. Perhaps it's just as well.