Walkman and conveyor belt: what they have in common

1. Step 1. Walkman — evolved into — MP3 player. The digital successor of the portable player.
2. Step 2. MP3 player — has part — Flash memory. Flash memory.
3. Step 3. Flash memory — is part of — Solid-state drive. Flash memory.
4. Step 4. Solid-state drive — evolved from — Hard disk drive. A replacement for the hard disk.
5. Step 5. Hard disk drive — has part — Ball bearing. Bearings (later fluid-dynamic ones).
6. Step 6. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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