Collimator helmet and diesel engine: what they have in common

1. Step 1. Collimator helmet — is part of — Gamma Knife. It brings the rays to one point.
2. Step 2. Gamma Knife — uses — Radioactivity. Cobalt-60.
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 — Diesel engine. Pistons move in the cylinders.

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