David: When I was a kid, I experimented with physics and chemistry.
Calvin: How did you do that, Dad?
D: Well, my friends and I would work in my garage and make hydrogen and fill a balloon with it. Then we'd tie a string around it, take it outside, and let it go. But as we let it go, we'd set the string on fire. Once the string burned through, the balloon would explode.
C: That is so cool! I want to do that. And how was that chemistry AND physics?
D: Well, the creation of hydrogen was chemistry, and the explosion was physics.
Me: Did your mother know you were conducting these "experiments"?
D: Um ....
Me: Calvin, you are not allowed to do that. I do not want my house or garage to be accidentally blown up.
D: Your mother's right. You shouldn't do that without adult supervision.
C: Would we consider you an adult in this situation, Dad?
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