Ion thruster and knife: what they have in common

1. Step 1. Ion thruster — uses — Reaction force. Jet thrust.
2. Step 2. Reaction force — is used in — Water-jet propulsion. A jet of water.
3. Step 3. Water-jet propulsion — is made of — Stainless steel. The impeller is stainless steel.
4. Step 4. Stainless steel — is material for — Cutlery. Stainless steel.
5. Step 5. Cutlery — has part — Knife. Knives.

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