Derrick Charles Hess, 29, was babysitting his five year old niece on northwest Scott Street when he thought it would be a good idea to teach her to start a car.  Hillsboro Police Lieutenant Michael Rouches says the child started the car, but her foot slipped off the clutch, the car rolled into a mini-van, knocked down a 64 year old woman.  The fall broke her pelvis.  Hess faces charges of child endangerment, reckless endangering, criminal mischief and assault.