Tape recorder and fuel cell: what they have in common

1. Step 1. Tape recorder — evolved into — Sampler. The idea of playing recorded sounds (the Mellotron).
2. Step 2. Sampler — has part — Analog-to-digital converter. Digitization.
3. Step 3. Analog-to-digital converter — is part of — Cochlear implant. Digital processing.
4. Step 4. Cochlear implant — is made of — Platinum. The electrodes are platinum.
5. Step 5. Platinum — is material for — Fuel cell. A platinum catalyst.

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