Radiotracer vial and car: what they have in common

1. Step 1. Radiotracer vial — is used in — PET scanner. A tracer with a positron-emitting isotope.
2. Step 2. PET scanner — has part — Photodiode. Photodetectors register the scintillations.
3. Step 3. Photodiode — is part of — Lidar. A receiver of reflected light.
4. Step 4. Lidar — is part of — Self-driving car. Lidar builds a 3D map of the surroundings.
5. Step 5. Self-driving car — is a kind of — Car. A self-driving car is an ordinary car driven by a computer with cameras and sensors.

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