Everyone else was at school so I took Rachel Rachel to the library and then the park. She decided she wanted to swing. She swings in the baby swings because she likes to fly. This requires no hands on the chains and she has learned from experience that letting go of the chains on the big swings causes her to fall, not fly. After a couple of big pushes she let go and was flying as she says "like a bird." "Are you a bird?" "No, I don't have feathers."
We then discussed what could and could not fly. Birds can, chickens can, ducks can't. Cats can't, cows can't, people can. "Can you fly if you jump from the roof of the house?" "No" "Can you fly if you jump from the hood of the car?" "No" "Can people really fly?" "Yes" You'll never convince her otherwise.