Moped and LIGO: what they have in common

1. Step 1. Moped — has part — Pedal. A moped can be pedalled.
2. Step 2. Pedal — is part of — Michaux velocipede. Pedals.
3. Step 3. Michaux velocipede — evolved into — Penny-farthing. A large wheel increased the speed per turn of the pedals.
4. Step 4. Penny-farthing — has part — Ball bearing. Bearings.
5. Step 5. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
6. Step 6. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

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