Explaining The Universe on Instagram: "The Three Gorges Dam in China is the largest hydroelectric dam in the world, holding back an enormous reservoir of water on the Yangtze River. Because the dam displaces such a massive volume of water—tens of billions of tons—it actually has a tiny effect on Earth itself. When the reservoir fills, water spreads out across the land at a higher elevation, which slightly increases Earth’s moment of inertia (its resistance to spinning). Just like a figure skater