Water-jet propulsion and lathe: what they have in common

1. Step 1. Water-jet propulsion — uses — Reaction force. A jet of water.
2. Step 2. Reaction force — is used in — Ion thruster. Jet thrust.
3. Step 3. Ion thruster — is made of — Tungsten. The cathodes are tungsten.
4. Step 4. Tungsten — is material for — High-speed steel. Tungsten.
5. Step 5. High-speed steel — is used in — Lathe. Cutting tools.

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