Bipolar transistor and micrometer: what they have in common

1. Step 1. Bipolar transistor — is a kind of — Transistor. A transistor.
2. Step 2. Transistor — is part of — Flash memory. Each cell is a floating-gate transistor.
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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