Digital camera and boiler: what they have in common

1. Step 1. Digital camera — evolved from — Camera. A sensor instead of film.
2. Step 2. Camera — is part of — Bubble chamber. Photographing the tracks.
3. Step 3. Bubble chamber — uses — Latent heat. A particle leaves a trail of boiling bubbles.
4. Step 4. Latent heat — is used in — Boiler. Evaporation needs latent heat.

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