Personal computer and lathe: what they have in common

1. Step 1. Personal computer — has part — Hard disk drive. A hard disk.
2. Step 2. Hard disk drive — is made of — Cobalt. The magnetic layer is a cobalt alloy.
3. Step 3. Cobalt — is material for — Cemented carbide. A cobalt binder.
4. Step 4. Cemented carbide — is made of — Tungsten. Tungsten carbide.
5. Step 5. Tungsten — is material for — High-speed steel. Tungsten.
6. Step 6. High-speed steel — is used in — Lathe. Cutting tools.

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