Giant robot vehicles have long been a staple of science fiction. When do we reality-dwellers get ours?
Reader Nathan asks: "Do you think we'll ever be able to build robot mecha like the Gundams from the Japanese anime series Gundam or the Valkyries from the Japanese anime series Macross?"
The comment box is open. Practical? Plausible? What are the obstacles?
Submit your science and technology questions to firstname.lastname@example.org.