Hair rollers and piston pump: what they have in common

1. Step 1. Hair rollers — works like — Curling iron. Both shape a curl: a curling iron does it at once with heat, rollers while the hair dries or cools.
2. Step 2. Curling iron — has part — Thermostat. A thermostat holds the set temperature so the hair is not burnt.
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 from — Piston pump. Guericke adapted the piston pump to pump out air.

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