Last Halloween, Sonia Chernova hardly left her doorstep in Decatur, Georgia, handing out sweets to a constant stream of kids. This year, she put an autonomous robot on the porch to do it for her. It gave out 1,000 pieces in three hours to hundreds of kids. “Best Halloween ever,” said Chernova, an assistant professor in the School of Interactive Computing. “Both kids and parents loved getting candy from a real robot, and many people stayed around to watch it work.