Evaporation Made Simple

We have a rain gauge mounted on a fencepost and every Wednesday the kids check it and record the amount of rain for the week. This week, it was empty. "But", Sisterwho said, "it rained a couple of days ago". "Aha", I thought to myself, "the perfect opportunity to discuss the effects of heat and humidity and resulting evaporation"! But before I could begin, Littlewho said, "It was the sun, it dries up the water". Sister and I both looked at him and I know she was thinking the same thing I was, namely-"How does he know that?".

I said, "Littlewho, you're correct, and how did you figure that out?". He gave us a look that appeared to say, "Ok, you simple-minded fools" and then he said, "Well, you know that song about the Itsy Bitsy spider....."and out came the sun and dried up all the rain.....?".

Duh!