I know how to put my shoes on!!! one of d's inventions, taped cars together so he can play with all of them at once. Ok, I'm sure when my kids were 4 they didn't know the word invention or if they did they didn't talk about inventing things. D is always inventing things, and explaining his ideas to us. He wants to invent a scooter with an unbrella so you can ride in the rain. He is always building things with his tinkertoys and blocks. Think he gets it from his dad and great grandpa.