Z (4 1/2) just asked us, "What keeps the heat from escaping from the Earth?"
"The air of our atmosphere," I answered.
J (almost 7) chimed in, "Yeah, especially methane. It's causing global warming." Of course, he remembers that because it's associated with rude bodily functions.
This is while they're watching Nature on PBS, the second time they've watched the episode about desert lions.
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