Pulse oximeter and needle: what they have in common

1. Step 1. Pulse oximeter — is part of — Smartwatch. A heart-rate and SpO₂ sensor.
2. Step 2. Smartwatch — evolved from — Wristwatch. The form factor of a wristwatch.
3. Step 3. Wristwatch — is made of — Gold. The case is gold or silver.
4. Step 4. Gold — is material for — Dentures. Etruscan dentures were gold bands.
5. Step 5. Dentures — is made of — Bone. With teeth made of bone or real teeth.
6. Step 6. Bone — is material for — Needle. The first needles with an eye were carved from bone.

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