Boiling. It's something you come to just accept as normal, like gravity, or opossums, but it's actually really kinda weird. Watch a pan of water boil on the stove. (It'll happen, no matter what they say.) Where do the bubbles come from? They start on the bottom, UNDER the water. Where does the air come from? How does it get under there? It's rapid vaporization of the water and the bubbles really only form because the pressure from the expanding steam is greater than the pressure of the water. So that's not all that weird, when you think about it, but until you've read or deduced the explanation..just LOOK at it. We learn pretty early on that you can't get something from nothing, but this every-day phenomenon seems to defy that.
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