Auger and LIGO: what they have in common

1. Step 1. Auger — evolved from — Archimedes’ screw. The Archimedes’ screw as a conveyor.
2. Step 2. Archimedes’ screw — is used in — Irrigation. The Archimedes’ screw lifted water for irrigation.
3. Step 3. Irrigation — includes — Drip irrigation. A kind of irrigation.
4. Step 4. Drip irrigation — has part — Water filter. Water is filtered before the drippers, or the thin tubes clog.
5. Step 5. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
6. Step 6. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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