Saw and vacuum pump: what they have in common

1. Step 1. Saw — evolved into — Chainsaw. A mechanized saw.
2. Step 2. Chainsaw — has part — Internal combustion engine. A two-stroke engine.
3. Step 3. Internal combustion engine — has part — Cylinder. Combustion takes place in the cylinders.
4. Step 4. Cylinder — is part of — Piston pump. The piston moves in a cylinder.
5. Step 5. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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