Separator and camera: what they have in common

1. Step 1. Separator — is part of — Lithium-ion battery. The separator keeps the electrodes apart and prevents a short circuit.
2. Step 2. Lithium-ion battery — is part of — Quadcopter (drone). A lithium-polymer battery.
3. Step 3. Quadcopter (drone) — has part — Smartphone camera. A camera.
4. Step 4. Smartphone camera — evolved from — Camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.

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