Jet ski and micrometer: what they have in common

1. Step 1. Jet ski — has part — Water-jet propulsion. A water jet.
2. Step 2. Water-jet propulsion — is made of — Stainless steel. The impeller is stainless steel.
3. Step 3. Stainless steel — is material for — Vernier caliper. Stainless steel.
4. Step 4. Vernier caliper — evolved into — Micrometer. A more precise instrument.

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