Pasteurization and optical telegraph: what they have in common

1. Step 1. Pasteurization — is used in — Canning. Sterilization by heat.
2. Step 2. Canning — uses — Tin can. Canned food in tins.
3. Step 3. Tin can — is made of — Tin. Tinplate.
4. Step 4. Tin — is material for — Phonograph. The recording is on tin foil.
5. Step 5. Phonograph — was inspired by — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.
6. Step 6. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

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