Index of what is a greatest invention on the human history?
A basic book for grinding mill which is old and for specialist, I copyed here in Chapter 2.
2. copy for reference( History of Milling)
3. What is a greatest invention on the human history?
4. The invention of the making powder was a greatest invention on the human history
5. Human changed from food collector to food producer
6. Invension of separation process
7. Scale up of the tool
8. Appearance of rotary quern (rotary mill)