Limestone blocks and micrometer: what they have in common

1. Step 1. Limestone blocks — is part of — Egyptian pyramid. Limestone and granite blocks of masonry.
2. Step 2. Egyptian pyramid — uses — Inclined plane. According to a common hypothesis, the blocks were raised on ramps.
3. Step 3. Inclined plane — evolved into — Screw. A screw is an inclined plane wrapped around a cylinder.
4. Step 4. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

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