Comb teeth and diesel engine: what they have in common

1. Step 1. Comb teeth — is part of — Pitchfork. Two to four tines for lifting hay.
2. Step 2. Pitchfork — has part — Handle. A handle.
3. Step 3. Handle — is part of — Sickle. A short one-handed handle.
4. Step 4. Sickle — evolved into — Combine harvester. The machine replaced reaping by hand.
5. Step 5. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.

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