Stone tool and LIGO: what they have in common

1. Step 1. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.
2. Step 2. Hammer — includes — Reflex hammer. A hammer.
3. Step 3. Reflex hammer — is made of — Vulcanized rubber. A rubber head.
4. Step 4. Vulcanized rubber — is material for — Base isolation. Rubber–steel bearings.
5. Step 5. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

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