The Harappan Civilization was like the ancient world’s neat freaks—they had grid-planned cities, indoor plumbing, and public baths while most of the world was still figuring out “where do we put the waste?” They traded beads, cotton, and mysterious seals, but apparently forgot to leave us a decoder ring for their writing, so now historians just stare at their symbols like 🤔. Then one day, poof—they vanished, leaving behind tidy ruins and a whole lot of unanswered questions.