Remember how you spent all of third-year French writing notes back and forth to that girl and she eventually agreed to go out with you and you did make it to second base, but now you can hardly parle un mot de français? Historical lenses are like that, my friend. With every choice, something is gained and something is lost. Right, so in discussing agriculture and early river valley civilizations, we've been approaching history through the lens of resource distribution and geography. And just as the violent and capricious Tigris and Euphrates rivers shaped the worldview of early Mesopotamians, the Nile shaped the worldview of the Egyptians. Let's go to the Thought Bubble. The Nile was regular, navigable, and benign, making for one of the safest and richest agricultural areas in the world.