America has a new engineering wonder close to the Hoover Dam.  Opened earlier this month, the Mike O'Callaghan-Pat Tillman Memorial Bridge stretches over the Colorado River at a height of 890 feet and is part of a project to allow commercial traffic to reach the Las Vegas area without taking the narrow, hairpin curved two lane highway that runs along the top of the dam.  This will speed traffic and allow tourists faster access to the region, which draws millions every year.  After 9/11, the F...
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