Fire pump and glasses: what they have in common

1. Step 1. Fire pump — has part — Piston pump. A fire pump is a piston pump.
2. Step 2. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.
3. Step 3. Vacuum pump — is part of — Electron microscope. A vacuum in the column.
4. Step 4. Electron microscope — evolved from — Microscope. Overcoming the limit of optics.
5. Step 5. Microscope — evolved from — Glasses. Spectacle makers assembled the first microscopes.

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