Science: Diamonds May Not Be Forever

Experiments could prove that all matter eventually decays

If a physicist says he is being sent off to a salt mine these days, he may not be joking. He could be heading 40 km (25 miles) east of Cleveland, where an 81-ton digging machine is carving a huge cavity in a salt mine 600 meters (2,000 ft.) below the ground. When excavation is completed, the cavern will be lined with synthetic rubber and filled with 10,000 tons of exceptionally pure, filtered water. Then, about two years from now, physicists will begin looking in the pool...

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