It’s just that over the last 200 years, the clouds have proven an improbably resilient adversary, and the weather in general has resisted numerous well-funded—and often quite imaginative—attempts at manipulation by meteorologists, physicists, and assorted hobbyists. Some have tried to make it rain, while others have tried to make it stop. Balloons full of explosives have been sent into the sky, and large quantities of electrically charged sand have been dropped from airplanes. One enduring scheme is to disrupt and weaken hurricanes by spreading oil on the surface of the ocean.