Needle and turbine: what they have in common

1. Step 1. Needle — is part of — Sewing machine. A needle with the eye near its point.
2. Step 2. Sewing machine — has part — Cam. Cams drive the fabric feed.
3. Step 3. Cam — is part of — Trip hammer. Cams on the shaft lift the hammer.
4. Step 4. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
5. Step 5. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.

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