The world's largest dam holds a secret NASA calculated nearly two decades ago, and it proves humans can now nudge the planet's rotation with a single structure.
In central China, the Yangtze River is held back by an engineering marvel so massive that it doesn’t just generate power or control floods. It physically alters the planet’s rotation. The Three Gorges Dam, completed in 2012, stretches more than 2,300... [3947 chars]