Stewie's mastery of physics and mechanical engineering are at a level of science fiction. He has constructed advanced fighter-jets, mind control devices, a weather control device, a teleportation device, robots, clones, a working Transporter device from "Star Trek", time machines, a Multiverse Transporter, a shrinking pod, as well as an assortment of weapons including lasers, rocket launchers, and crossbows. Stewie employs these to cope with the stresses of infant life (such as teething pain, and eating broccoli) and to murder his mother, Lois, with mixed success at best depending on the objective. As made clear in the pilot episode, Stewie's matricidal tendencies are a result of Lois constantly (and unwittingly) thwarting his schemes, and so he desires to kill her to carry out his plans without her interference. In other, later episodes, Stewie engages in other violent or criminal acts, including robbery, aggravated assault, carjacking, loan sharking, forgery, and killing off many minor characters (with a tank, guns, and other assorted weaponry).