Hollow bronze sphere and refrigerator: what they have in common

1. Step 1. Hollow bronze sphere — is part of — Heron’s aeolipile. It rotates on tubular axles.
2. Step 2. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.
3. Step 3. Turbine — is part of — Gas turbine. A turbine.
4. Step 4. Gas turbine — has part — Compressor. A compressor.
5. Step 5. Compressor — is part of — Refrigerator. A compressor with an electric motor.

Open Evothings