Saw and gyroscope: what they have in common

1. Step 1. Saw — evolved into — Chainsaw. A mechanized saw.
2. Step 2. Chainsaw — has part — Roller chain. The cutting chain is a roller chain with teeth.
3. Step 3. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
4. Step 4. Electric bicycle — has part — Hub motor. A hub motor or a mid-drive motor.
5. Step 5. Hub motor — is part of — Hoverboard. Hub motors.
6. Step 6. Hoverboard — has part — Gyroscope. Gyroscopes keep the balance.

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