High-speed steel and aeroplane: what they have in common

1. Step 1. High-speed steel — is used in — Lathe. Cutting tools.
2. Step 2. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.
3. Step 3. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.
4. Step 4. Kite — evolved into — Glider. Lilienthal and Cayley studied the wing with kites and gliders.
5. Step 5. Glider — evolved into — Aeroplane. The Wrights added an engine to a glider.

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