Today we talked about evaporation and water turning from a liquid to a gas. So we filled a glass with water, put it out in the sun, and planned to check on it in a couple of days to see what happened.
The problem is, it rained this afternoon. It didn't rain a whole lot, but still, it kind of defeated the purpose.
It's a good thing we've done this same basic experiment before, so they already have seen this concept in action. I guess now it's time to talk about the water cycle since the rain phase so rudely interrupted!