Why'd It Take So Long To Invent The Wheel?
Way, way back, when your caveman grandpa or grandma had to lug something heavy back to the cave, what did they do? Maybe they carried it. Or dragged it. Or tumbled it down a hill. But what they didn't do is wheel it home. They couldn't. Because there no wheels to wheel with. Which is puzzling, really. How could our great, great, great grandparents go for tens of thousands, maybe hundreds of thousands of generations not thinking, not making, not even imagining a wheel? Wheels appear extremely recently — around 3500 BC — when people were already counting, writing, farming. Why the long wait?
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