Video call and syringe: what they have in common

1. Step 1. Video call — uses — Smartphone camera. A camera.
2. Step 2. Smartphone camera — evolved from — Camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.
3. Step 3. Camera — is part of — Bubble chamber. Photographing the tracks.
4. Step 4. Bubble chamber — has part — Piston. It releases pressure.
5. Step 5. Piston — is part of — Syringe. A plunger.

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