Gallium arsenide and syringe: what they have in common

1. Step 1. Gallium arsenide — is material for — Lidar. The laser diodes are gallium arsenide.
2. Step 2. Lidar — is part of — Robot vacuum. Navigation by lidar.
3. Step 3. Robot vacuum — has part — Microprocessor. Control.
4. Step 4. Microprocessor — is part of — Insulin pump. A dosing controller.
5. Step 5. Insulin pump — uses — Insulin. It doses insulin.
6. Step 6. Insulin — uses — Syringe. Injections.

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