Standard Model and fitness tracker: what they have in common

1. Step 1. Standard Model — uses — Quantum mechanics. Quantum field theory.
2. Step 2. Quantum mechanics — evolved from — Photoelectric effect. Quanta of light.
3. Step 3. Photoelectric effect — works like — Photovoltaic effect. The internal and external photoelectric effects.
4. Step 4. Photovoltaic effect — is used in — Photodiode. Light generates a current in the junction.
5. Step 5. Photodiode — is part of — Pulse oximeter. A photodiode.
6. Step 6. Pulse oximeter — is part of — Fitness tracker. An optical heart-rate sensor.

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