Wool and LIGO: what they have in common

1. Step 1. Wool — is material for — Felt. Matted wool.
2. Step 2. Felt — is material for — Piano. The hammers are covered with felt.
3. Step 3. Piano — uses — Tuning fork. Tuning.
4. Step 4. Tuning fork — is part of — Quartz clock. Quartz shaped like a tuning fork at 32,768 Hz.
5. Step 5. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
6. Step 6. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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