Video decoder chip and LIGO: what they have in common

1. Step 1. Video decoder chip — is part of — Set-top box. It decodes compressed video.
2. Step 2. Set-top box — has part — System on a chip (SoC). Inside is an SoC.
3. Step 3. System on a chip (SoC) — is part of — Smartwatch. Inside is a system on a chip.
4. Step 4. Smartwatch — has part — Pulse oximeter. A heart-rate and SpO₂ sensor.
5. Step 5. Pulse oximeter — has part — Photodiode. A photodiode.
6. Step 6. Photodiode — is part of — LIGO. A photodetector of the interference.

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