MP3 and railway track: what they have in common

1. Step 1. MP3 — is used in — Streaming. Sound compression.
2. Step 2. Streaming — uses — Data centre. Servers.
3. Step 3. Data centre — is made of — Concrete. The building is concrete.
4. Step 4. Concrete — is material for — Sleeper. Today sleepers are more often concrete than wood.
5. Step 5. Sleeper — is part of — Railway track. Sleepers.

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