A life in pipes

December 23, 2007 | 12:00 a.m. CST
Dr. Henry Liu displays a new brick he has created by compressing fly ash from coal-fired power plants. The manufacturing process requires only 20 percent of the energy it would take to create a normal brick because the bricks do not have to be baked at a high temperature. The bricks were featured recently in TIME magazine as one of the best inventions of the year.

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