Sand mining accounts for 85 percent of all worldwide mineral extraction, a $70 billion industry. In Cambodia, the practice is big business -- but it comes with a price. The country relies upon the Mekong River for commerce and transportation,…
By Fred de Sam Lazaro
By PBS NewsHour
The collapse of the Twin Towers served as a stark and stunning reminder to architects and engineers of the value of using concrete to protect skyscrapers from the ravages of fire. Miles O'Brien reports on how the design of skyscrapers…
Thirteen months after a bridge collapse killed 13 people in Minnesota, a new 10-lane structure reopens to traffic Thursday morning. Fred de Sam Lazaro reports on the engineering behind the I-35W's multi-million-dollar reconstruction.
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