Theory of relativity and rock drill: what they have in common

1. Step 1. Theory of relativity — is used in — GPS (satellite navigation). Corrections for the relativistic slowing of clocks.
2. Step 2. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
3. Step 3. Reusable rocket — is made of — Kerosene. The fuel is kerosene or methane.
4. Step 4. Kerosene — is used in — Ramjet. The fuel is kerosene.
5. Step 5. Ramjet — uses — Compressed air. The air is compressed by the oncoming flow.
6. Step 6. Compressed air — is used in — Rock drill. Pneumatics.

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