Telemedicine and dewar flask: what they have in common

1. Step 1. Telemedicine — uses — Fitness tracker. Remote monitoring.
2. Step 2. Fitness tracker — has part — Pulse oximeter. An optical heart-rate sensor.
3. Step 3. Pulse oximeter — has part — Photodiode. A photodiode.
4. Step 4. Photodiode — is part of — LIGO. A photodetector of the interference.
5. Step 5. LIGO — uses — Vacuum. 4 km vacuum tubes.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

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