During ancient times. the Greeks would pray to the rain gods, sometimes even offering a human sacrifice in the hopes that it would rain. Native s Americans and many Europeans also had special customs meant to control the weather. As we all know, there is no correlation between hoping for rain and creating clouds. But several decades ago, meteorology scientists came up with a method to improve the chance of rain: cloud seeding. This involves adding into the particles sky, which helps water droplets grow faster, thereby increasing levels of precipitation.