Graphene and modem: what they have in common

1. Step 1. Graphene — is made of — Carbon. Graphene is a layer of carbon one atom thick.
2. Step 2. Carbon — is material for — Hearing aid. The first hearing aids used a carbon microphone.
3. Step 3. Hearing aid — evolved from — Telephone. The first electric hearing aids were built from telephone components.
4. Step 4. Telephone — is used in — Modem. It works over a telephone line.

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