Paint and fitness tracker: what they have in common

1. Step 1. Paint — has part — Dye. A pigment.
2. Step 2. Dye — uses — Fermentation. Some dyes (indigo) were obtained by fermenting plants.
3. Step 3. Fermentation — is a kind of — Chemical reaction. A biochemical reaction.
4. Step 4. Chemical reaction — is used in — Airbag. The gas comes from an instant reaction of sodium azide.
5. Step 5. Airbag — has part — Accelerometer. The crash sensor is an accelerometer.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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