Inhaler and LIGO: what they have in common

1. Step 1. Inhaler — has part — Valve. A metering valve.
2. Step 2. Valve — is used in — Drip irrigation. Drippers.
3. Step 3. Drip irrigation — has part — Water filter. Water is filtered before the drippers, or the thin tubes clog.
4. Step 4. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
5. Step 5. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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