Hugh has spent several hours inventing a rubber band gun. He’s using cardboard, plywood and duct tape in the construction, and keeps coming up against problems he needs to address. I think he needs his Daddy to be able to explain some of the physics principles he is working with – I made an attempt to explain force and how the elastic band was acting as a way of storing the energy used to extend it, but I really only have a fairly hazy understanding, oops.