Hydraulic brake and personal computer: what they have in common

1. Step 1. Hydraulic brake — is used in — Car brake. Brake actuation.
2. Step 2. Car brake — is part of — Electric car. Besides regeneration, ordinary friction brakes are needed.
3. Step 3. Electric car — has part — Neodymium magnet. Synchronous traction motors use neodymium magnets.
4. Step 4. Neodymium magnet — is part of — Hard disk drive. The head actuator.
5. Step 5. Hard disk drive — is part of — Personal computer. A hard disk.

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