Plasma and telephone: what they have in common

1. Step 1. Plasma — is used in — Plasma display. A gas discharge.
2. Step 2. Plasma display — is part of — Flat-screen TV. Plasma TVs.
3. Step 3. Flat-screen TV — has part — Display. A flat TV is basically a big display — LCD or OLED.
4. Step 4. Display — is part of — Mobile phone. The phone's screen shows the number, messages and menus.
5. Step 5. Mobile phone — evolved from — Telephone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.

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