Puffy clouds contain a breathtaking amount of water. The volume of even a small one can top 750 cubic kilometers, and if you figure a half gram of water per cubic meter, those wispy balls of atmospheric fluff start looking like flying lakes.*
Now imagine you are a farmer watching them glide over drought-parched fields, carrying more than enough water to save your crops and pull you out of debt yet yielding only a few tantalizing drops before disappearing over the horizon. It is that maddening condition that leads people worldwide to spend millions of dollars every year trying to control the rain.