RSS and bellows: what they have in common

1. Step 1. RSS — is used in — Podcast. Subscription via RSS.
2. Step 2. Podcast — uses — MP3. Audio files.
3. Step 3. MP3 — uses — Algorithm. A compression algorithm.
4. Step 4. Algorithm — is used in — Program control of a machine. A program is a written algorithm.
5. Step 5. Program control of a machine — is used in — Player piano. The tune is recorded on a perforated roll.
6. Step 6. Player piano — has part — Bellows. Pedal bellows create suction.

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