Fire making and micrometer: what they have in common

1. Step 1. Fire making — is used in — Pottery. The first pottery was fired right in a campfire.
2. Step 2. Pottery — evolved into — Saucepan. The first pots were ceramic.
3. Step 3. Saucepan — is made of — Stainless steel. Stainless steel.
4. Step 4. Stainless steel — is material for — Vernier caliper. Stainless steel.
5. Step 5. Vernier caliper — evolved into — Micrometer. A more precise instrument.

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