Drais’s running machine and laser: what they have in common

1. Step 1. Drais’s running machine — works like — Kick scooter. A kick scooter and a running machine both move by pushing off the ground with a foot and have no drive.
2. Step 2. Kick scooter — has part — Ball bearing. A scooter’s wheels turn on ball bearings.
3. Step 3. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
4. Step 4. Base isolation — is part of — LIGO. The suspension damps ground vibrations.
5. Step 5. LIGO — uses — Laser. A laser.

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