Pile and aeroplane: what they have in common

1. Step 1. Pile — is used in — Pile driver. It drives piles.
2. Step 2. Pile driver — has part — Block and tackle. Lifting the weight.
3. Step 3. Block and tackle — has part — Rope. The rope runs around the pulleys.
4. Step 4. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.
5. Step 5. Kite — evolved into — Glider. Lilienthal and Cayley studied the wing with kites and gliders.
6. Step 6. Glider — evolved into — Aeroplane. The Wrights added an engine to a glider.

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