Fuel injection and internet: what they have in common

1. Step 1. Fuel injection — evolved from — Carburettor. Fuel injection replaced carburettors.
2. Step 2. Carburettor — has part — Valve. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
3. Step 3. Valve — is used in — Drip irrigation. Drippers.
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 — Internet. The backbones are silica optical fibre.

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