Indus Valley was a very smart civilization. They had good plans and they plan before they do anything. All of their roads where staight, so that 2 bullrock carts can pass each other. They had higher and lower parts of the city, so the Priests and Rulers lived up there. some inventions where: The button, made from seashells in 2000 BCE. Rulers, Measuring rod in 2650 BCE. Stepwell, where you would go down stairs into a pond. The tools they used that we use today is hammers, knives, needles, fishing hocks, axes, razors, and saws. Their tools where made from stone called flint. The metal that was most used was copper. They made bronze my mixing copper and tin.