What ancient Mesopotamian legal code, predating the Code of Hammurabi by several centuries, is known for its detailed provisions on property, family, and commerce, and was inscribed on a stone monument?

What was the name of the nomadic warrior people from the Pontic-Caspian steppe who, during the Bronze Age, are credited with the invention of the chariot and are associated with the Yamnaya culture?

Which of these historical figures was the first to propose a detailed plan for an international auxiliary language to facilitate global communication?