Hailstone
Because hail damages crops, there has been many efforts to stop hail. In the 16th century, farmers used to shoot cannons at thunderstorms, thinking this would destroy the hail. Cloud seeding (trying to make rain by putting dry ice crystals or a kind of smoke in clouds) is the more recent way, but it is expensive and we do not know for sure how well it works. To this day, there is no proved way of stopping hailstorms.