Walkman and micrometer: 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 — Flight recorder. Memory.
4. Step 4. Flight recorder — is made of — Stainless steel. Stainless steel.
5. Step 5. Stainless steel — is material for — Vernier caliper. Stainless steel.
6. Step 6. Vernier caliper — evolved into — Micrometer. A more precise instrument.

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