Platinum and r-7 rocket: what they have in common

1. Step 1. Platinum — is material for — Fuel cell. A platinum catalyst.
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 — R-7 rocket. RD-107 and RD-108 engines.

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