Dishwasher and modem: what they have in common

1. Step 1. Dishwasher — has part — Heating element. Heating the water.
2. Step 2. Heating element — is a kind of — Resistor. A heater is a resistor designed to release heat.
3. Step 3. Resistor — is made of — Carbon. Later — carbon.
4. Step 4. Carbon — is material for — Hearing aid. The first hearing aids used a carbon microphone.
5. Step 5. Hearing aid — evolved from — Telephone. The first electric hearing aids were built from telephone components.
6. Step 6. Telephone — is used in — Modem. It works over a telephone line.

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