Photographic flash and electronic calculator: what they have in common

1. Step 1. Photographic flash — is part of — Camera. A flash.
2. Step 2. Camera — evolved into — Photolithography. A photographic process carried over to silicon.
3. Step 3. Photolithography — is used in — Integrated circuit. The circuit pattern is transferred by light.
4. Step 4. Integrated circuit — is part of — Electronic calculator. A chip.

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