Landmine and GPS (satellite navigation): what they have in common

1. Step 1. Landmine — uses — Gunpowder. Chinese mines of the 13th century were filled with gunpowder.
2. Step 2. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.
3. Step 3. Rocket — evolved into — Liquid-propellant rocket engine. Goddard switched to liquid fuel.
4. Step 4. Liquid-propellant rocket engine — is part of — Reusable rocket. Liquid-propellant engines.
5. Step 5. Reusable rocket — has part — GPS (satellite navigation). Navigation during landing.

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