Differential analyser and fuel cell: what they have in common

1. Step 1. Differential analyser — uses — Calculus. It solves differential equations.
2. Step 2. Calculus — is used in — Newton’s laws. Mechanics built on calculus.
3. Step 3. Newton’s laws — is used in — Tsiolkovsky rocket equation. It follows from the conservation of momentum.
4. Step 4. Tsiolkovsky rocket equation — is used in — Liquid-propellant rocket engine. Rocket design relies on Tsiolkovsky’s equation.
5. Step 5. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
6. Step 6. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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