Rubber inflation bulb and nuclear reactor: what they have in common

1. Step 1. Rubber inflation bulb — is part of — Blood pressure monitor. It forces air in.
2. Step 2. Blood pressure monitor — evolved from — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
3. Step 3. Manometer — is part of — Boiler. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
4. Step 4. Boiler — is part of — Steam turbine. Steam from the boiler.
5. Step 5. Steam turbine — is part of — Nuclear power plant. Steam turns the turbines — as at a thermal station.
6. Step 6. Nuclear power plant — has part — Nuclear reactor. The reactor heats the coolant.

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