Food processor and telephone: what they have in common

1. Step 1. Food processor — is made of — Stainless steel. The blades are stainless steel.
2. Step 2. Stainless steel — is material for — Egg beater. A whisk is stainless steel so it does not rust.
3. Step 3. Egg beater — is made of — Tin. The whisk is tinned sheet metal.
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 into — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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