Electric bicycle and LIGO: what they have in common

1. Step 1. Electric bicycle — has part — Hub motor. A hub motor or a mid-drive motor.
2. Step 2. Hub motor — is part of — Wheelchair. Powered wheelchairs.
3. Step 3. Wheelchair — has part — Ball bearing. Bearings.
4. Step 4. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
5. Step 5. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

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