How the world's largest dam works

This is the largest dam in the world... This dam is so powerful, it literally slowed down the Earth’s rotation. Meet the Three Gorges Dam — the largest dam on the planet, built across China’s Yangtze River. It stretches over 2.3 kilometers... and cost more than 31 billion dollars to construct. The amount of water it holds... is so massive... it actually slowed Earth’s rotation by 0.06 microseconds. Every year... it generates over 93.5 terawatt-hours of electricity — enough to power a city like L