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ROME, March 25 (Reuters) - Archaeologists in Pompeii have unearthed an ancient building site that sheds light on construction techniques used by the Romans to make iconic structures such as the ...

To Scott Smith, old bricks or cobblestones are like gems. And he's made a successful – and unusual – career out of mining them from almost any construction or demolition site from Maine to Chicago.

Camp fires built in Kaibob National Forest routinely make use of stones once used for prehistoric pueblo construction. Exposure to the fire's heat makes chemical analysis and carbon dating difficult.