Curved sickle blade and newcomen engine: what they have in common

1. Step 1. Curved sickle blade — is part of — Sickle. A semicircular blade gathers the stems to the cut.
2. Step 2. Sickle — evolved from — Stone tool. The first sickles had flint inserts.
3. Step 3. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.
4. Step 4. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Step 5. Steam hammer — has part — Boiler. A boiler supplies the steam.
6. Step 6. Boiler — is part of — Newcomen engine. Steam from the boiler.

Open Evothings