Rare-earth metals and lathe: what they have in common

1. Step 1. Rare-earth metals — is material for — Smartphone. The magnets of the speakers and vibration motor are rare-earth.
2. Step 2. Smartphone — has part — Vibration motor. A tiny motor produces the vibration alert.
3. Step 3. Vibration motor — is made of — Tungsten. The eccentric weight is tungsten.
4. Step 4. Tungsten — is material for — High-speed steel. Tungsten.
5. Step 5. High-speed steel — is used in — Lathe. Cutting tools.

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