Wow, about fog.

On the radio today I learnt about humidity. It started as a question about why it can be raining, but only "50% humidity", not 100%. Answer: humidity is the amount of water in the air. In the air, not in raindrop form. When a cloud reaches 100% humidity the conditions to make raindrops are ripe. Warm air can carry more water in it than cold air. And this is the beautiful part: fog is the water coming out of the cold air and forming droplets and hanging around. Like magic. I love fog.