Rope core and bicycle: what they have in common

1. Step 1. Rope core — is part of — Climbing rope. It carries the load and stretches when jerked.
2. Step 2. Climbing rope — evolved from — Rope. A rope.
3. Step 3. Rope — is part of — Yo-yo. A thread.
4. Step 4. Yo-yo — uses — Angular momentum. Rotation.
5. Step 5. Angular momentum — is used in — Bicycle. The spinning wheels and the steering geometry help keep balance.

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