Email and gutenberg printing press: what they have in common

1. Step 1. Email — works like — Electrical telegraph. An instant text message over a network — like a telegram.
2. Step 2. Electrical telegraph — inspired — Phonograph. Edison came to the phonograph while working on recording telegraph and telephone signals.
3. Step 3. Phonograph — is made of — Tin. The recording is on tin foil.
4. Step 4. Tin — is used in — Linotype. A line is cast from type metal (lead, tin, antimony).
5. Step 5. Linotype — evolved from — Movable type. Mechanized typesetting.
6. Step 6. Movable type — is part of — Gutenberg printing press. Text is set from metal type.

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