Drum brake and glasses: what they have in common

1. Step 1. Drum brake — is a kind of — Car brake. A kind of brake.
2. Step 2. Car brake — is part of — Electric car. Besides regeneration, ordinary friction brakes are needed.
3. Step 3. Electric car — evolved into — Self-driving car. Most self-driving cars are built on electric platforms.
4. Step 4. Self-driving car — has part — Smartphone camera. Cameras.
5. Step 5. Smartphone camera — is part of — AR glasses. Cameras.
6. Step 6. AR glasses — evolved from — Glasses. Glasses with a display.

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