Valve and laser: what they have in common

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

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