Sterilization and sickle: what they have in common

1. Step 1. Sterilization — uses — Autoclave. Sterilization by steam.
2. Step 2. Autoclave — has part — Boiler. A steam generator.
3. Step 3. Boiler — is part of — Steam hammer. A boiler supplies the steam.
4. Step 4. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Step 5. Hammer — evolved from — Stone tool. The first hammer was a stone in the hand.
6. Step 6. Stone tool — evolved into — Sickle. The first sickles had flint inserts.

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