Hydrogen energy and internet: what they have in common

1. Step 1. Hydrogen energy — uses — Fuel cell. Fuel cells.
2. Step 2. Fuel cell — uses — Hydrogen. The fuel is hydrogen.
3. Step 3. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.
4. Step 4. Liquid-propellant rocket engine — is part of — Space Shuttle. Hydrogen-fuelled main engines.
5. Step 5. Space Shuttle — is made of — Silica (sand). The heat-shield tiles are silica fibre.
6. Step 6. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.

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