Blood bank and boyle’s air pump: what they have in common

1. Step 1. Blood bank — uses — Refrigerator. Cold storage.
2. Step 2. Refrigerator — has part — Thermostat. A thermostat.
3. Step 3. Thermostat — is used in — Sous vide. A precise temperature.
4. Step 4. Sous vide — uses — Vacuum sealer. Vacuum bags.
5. Step 5. Vacuum sealer — has part — Vacuum pump. A pump.
6. Step 6. Vacuum pump — evolved into — Boyle’s air pump. An improved version of Guericke’s pump.

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