Salt | Can’t Sleep? Learn About the Mineral That Built Empires

Salt is a mineral composed primarily of sodium chloride, and it is essential for life. But as this episode of I Can’t Sleep explains, its role in human history goes far beyond the dinner table. The episode traces salt’s journey from a Neolithic food preservative to a driver of wars, a source of government revenue, and a key industrial feedstock, making the case that this simple crystal has been a quiet but powerful force in shaping civilization.

The Ancient Engine of Trade and Power

The episode establishes that salt’s value was recognized incredibly early. Evidence of salt processing dates back to around 6000 BC in present-day Romania and China. The first known city in Europe, Solnitsata in Bulgaria, was built around a salt mine, and the rapid population growth of the Neolithic Pre-Cucuteni culture may have been directly linked to their ability to extract salt from spring water as far back as 6050 BC. This scarcity and universal need made salt a high-value commodity. It was prized by the ancient Hebrews, Greeks, Romans, Egyptians, and Hittites, and it became the backbone of major trade routes. Salt was transported by boat across the Mediterranean, along specially built "salt roads," and across the Sahara on camel caravans. The Tuareg people still maintain these ancient routes, with each camel carrying fodder and trade goods north to return laden with salt pillars and da