But then, the blocks that Wallace T. Wallington moves around near his home in a rural Flint area have weighed up to nearly 10 tons. And by himself, he moves these behemoth playthings, not with cranes and cables, but with wooden levers. "It's more technique than it is technology," Wallington says. "I think the ancient Egyptians and Britons knew this." Last October, a production crew from Discovery Channel in Canada came to Wallington's home to record him as he raised a 16-foot, rectangular, concrete block that weighed 19,200 pounds and set it into a hole. That taping was made into...