X-ray machine and refrigerator: what they have in common

1. Step 1. X-ray machine — evolved into — CT scanner. Tomography from many images.
2. Step 2. CT scanner — has part — Ball bearing. The gantry turns on a bearing.
3. Step 3. Ball bearing — is part of — Bogie. Axle boxes with roller bearings.
4. Step 4. Bogie — is part of — Refrigerator car. Bogies.
5. Step 5. Refrigerator car — uses — Ice house. At first — ice.
6. Step 6. Ice house — evolved into — Refrigerator. The refrigerator replaced natural ice.

Open Evothings