Duh, Daddy

This morning Emma showed me three marbles arranged as in the picture below:

Then she asked me if I knew what she had made with the marbles.  I said something like "One big circle and two little circles?" 

She said, "Nooooo.  Carbon Dioxide."

[Duh, Daddy.]

She's either a genius or she's watched this video (or listened to the song) a few too many times.