Bent steam nozzles and rope: what they have in common

1. Step 1. Bent steam nozzles — is part of — Heron’s aeolipile. Jets of steam spin the ball.
2. Step 2. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.
3. Step 3. Turbine — is part of — Dental drill. An air-driven turbine handpiece.
4. Step 4. Dental drill — works like — Electric drill. The same task — spinning a drill bit; the foot-powered dental drill appeared before the electric drill.
5. Step 5. Electric drill — evolved from — Bow drill. The oldest rotary drilling tool.
6. Step 6. Bow drill — has part — Rope. The bowstring wraps around the drill.

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