When I made a list of the all-time ten best science fiction films for my book Hollywood Science (2010), I was surprised to find that three of them feature artificial creatures: machine-like robots in Metropolis (1927) and The Day the Earth Stood Still (1951), and human-like androids in Blade Runner (1982). Artificial beings are big in other science fiction films too. A keyword search on “robot” in the Internet Movie Database yields hundreds of feature films, from The Master Mystery (1920) through Westworld (1973), RoboCop (1987) and A. I. (2001) right up to Real Steel (2011) and this year’s Prometheus, with more in production.