My personal favorites on his blog are the series on how people produced Bread, Clothing, and Iron in the premodern world. The depth there is amazing, going into all the raw materials and different skills and processes required to support agriculture, textile production, and metallurgy. It really gives you a deep sense of the material conditions that shaped life in the past, and how alien pre-modern economic existence would be to 21st century folks (clothing and food were really really expensive, like one new set of clothes a year expensive, whereas housing costs were proportionally low). Highly recommended.