Movies and television are dotted with cool robot names: "R2-D2" from "Star Wars," "WALL-E," "Optimus Prime" from "Transformers" and "Rosie" from "The Jetsons." Closer to home (and in real life), Dan ...

Loaded with a reservoir of paint, and guided by computer, it works unsupervised, painting the lines on soccer, football, baseball, lacrosse and other athletic fields. In turn, it frees up human ...