Cold nuclear fusion may someday provide a clean, inexhaustable form of energy - that is also cheap.

But for the general public, learning how fusion in a flask actually works can be expensive.The American Chemical Society, hoping to gain a few bucks as well as kudos from the fusion breakthrough of its member B. Stanley Pons, has made available a videotape of the Utah's April 12 scientific lecture in Dallas.

The two-hour tape, "Nuclear Fusion in a Test Tube," can be purchased from the society for a mere $450.

For immediate shipment, call 1-800-227-5558, or write to the society's distribution office, 1155 16th St. NW, Washington, D.C. 20036. Cash and major credit cards are accepted.

Of course, if the $450 price tag seems a bit steep, you can always wait for the movie.