Blog and sonar: what they have in common

1. Step 1. Blog — evolved from — Newspaper. A personal publication.
2. Step 2. Newspaper — uses — Rotary printing press. Mass print runs.
3. Step 3. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.
4. Step 4. Watt steam engine — evolved into — Steam turbine. The turbine replaced piston engines in large installations.
5. Step 5. Steam turbine — is part of — Destroyer. Turbines.
6. Step 6. Destroyer — has part — Sonar. Underwater acoustics.

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