Blog and micrometer: what they have in common

1. Step 1. Blog — evolved from — Newspaper. A personal publication.
2. Step 2. Newspaper — uses — Rotary printing press. Mass print runs.
3. Step 3. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
4. Step 4. Gutenberg printing press — has part — Movable type. Text is set from metal type.
5. Step 5. Movable type — works like — Interchangeable parts. Movable type is an early case of interchangeable parts: identical letters move from line to line.
6. Step 6. Interchangeable parts — uses — Micrometer. Precise measurement ensures interchangeability.

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