Hair rollers and lathe: what they have in common

1. Step 1. Hair rollers — works like — Curling iron. Both shape a curl: a curling iron does it at once with heat, rollers while the hair dries or cools.
2. Step 2. Curling iron — has part — Heating element. An electric curling iron is heated by a heating element, like an iron or a kettle.
3. Step 3. Heating element — works like — Incandescent light bulb. A lamp and a heater use the same effect — a conductor heated by current; they differ in purpose, light or heat.
4. Step 4. Incandescent light bulb — is made of — Tungsten. A tungsten filament (since 1904–1910).
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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