Skate blade and internet: what they have in common

1. Step 1. Skate blade — is part of — Ice skates. A steel blade.
2. Step 2. Ice skates — evolved into — Roller skates. Skates for dry land.
3. Step 3. Roller skates — has part — Ball bearing. Bearings.
4. Step 4. Ball bearing — is part of — CT scanner. The gantry turns on a bearing.
5. Step 5. CT scanner — uses — Computer. A computer reconstructs the image.
6. Step 6. Computer — is part of — Internet. The Internet links billions of computers.

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