Meat grinder and plough: what they have in common

1. Step 1. Meat grinder — has part — Knife. A cross-shaped blade.
2. Step 2. Knife — evolved from — Stone tool. The first knives were stone flakes.
3. Step 3. Stone tool — evolved into — Hoe. Neolithic hoes of stone and antler.
4. Step 4. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

Open Evothings