Helmet suspension liner and fitness tracker: what they have in common

1. Step 1. Helmet suspension liner — is part of — Helmet. A shock-absorbing suspension inside.
2. Step 2. Helmet — is made of — Kevlar. Modern ones are aramid.
3. Step 3. Kevlar — evolved from — Nylon. Aramids are relatives of polyamides.
4. Step 4. Nylon — is material for — Airbag. The airbag is nylon.
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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