Radiotracer vial and steam locomotive: what they have in common

1. Step 1. Radiotracer vial — is used in — PET scanner. A tracer with a positron-emitting isotope.
2. Step 2. PET scanner — uses — Radioactivity. A radioactive tracer.
3. Step 3. Radioactivity — is used in — Cloud chamber. Particle tracks.
4. Step 4. Cloud chamber — has part — Piston. A sudden expansion supersaturates the vapour.
5. Step 5. Piston — is part of — Watt steam engine. Steam pushes the piston in the cylinder.
6. Step 6. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.

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