Cell theory and rolling mill: what they have in common

1. Step 1. Cell theory — uses — Microscope. Observing cells.
2. Step 2. Microscope — evolved into — Electron microscope. Overcoming the limit of optics.
3. Step 3. Electron microscope — has part — Vacuum pump. A vacuum in the column.
4. Step 4. Vacuum pump — has part — Check valve. Valves stop air from flowing back.
5. Step 5. Check valve — uses — Pressure. A valve is opened by pressure in one direction.
6. Step 6. Pressure — is used in — Rolling mill. Squeezing with rolls.

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