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Supersonic tests defy a 70-year-old rule of metal strength

When engineers want to make a metal stronger, one of the most reliable strategies is to use smaller grains—the microscopic ...

Detroiters grapple with unknowns as lead, arsenic found at demo sites

"What is the cost to the people?" asked a resident who said he'd not been informed of numerous chemicals lacing a plot he'd planned to garden in.