Qanat and modem: what they have in common

1. Step 1. Qanat — uses — Gravity flow. Water flows by gravity.
2. Step 2. Gravity flow — is used in — Water filter. Water seeps through by gravity.
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 — Silicon. Silicon is obtained by reducing silica.
5. Step 5. Silicon — is material for — Modem. The chips are silicon.

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