Encyclopedia and headphones: what they have in common

1. Step 1. Encyclopedia — uses — Gutenberg printing press. The Encyclopédie was a printed publication.
2. Step 2. Gutenberg printing press — uses — Codex (book). The press printed sheets that were bound into codex books.
3. Step 3. Codex (book) — evolved into — E-reader. An electronic book.
4. Step 4. E-reader — has part — Flash memory. Memory.
5. Step 5. Flash memory — is part of — MP3 player. Flash memory.
6. Step 6. MP3 player — has part — Headphones. Headphones.

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