IBM researchers are attempting to warm up human-computer relationships. For example, IBM, International Business Machines, has been working on getting computers to recognize human (36) , such as an arm wave to move a (37) object on screen. Recently, the company’ s researchers have gone a (38) further by training a computer to recognize human (39) To demonstrate their progress, IBM (40) out Pong, a (41) head without body that can react to human facial expressions with a smile or a (42) Pong uses a camera to (43) your gestures in pain or anger or frowning and uses software to interpret what it sees. But don’t expect your computer to start grinning at you any time soon. (44) In the meantime, you can get a taste of the future by playing with basic gesture-recognition technology on your own Windows PC. (45) Cybernet’s $40 Headhunter software can track and translate head movements into game commands. Lean left, for example, and the onscreen view moves left. Cybernet programmers point out that this is more than fun and games: (46)