Foam core and telephone: what they have in common

1. Step 1. Foam core — is part of — Surfboard. A light buoyant core.
2. Step 2. Surfboard — is made of — Fibreglass. Fibreglass.
3. Step 3. Fibreglass — is material for — Motherboard. The board is fibreglass laminate.
4. Step 4. Motherboard — is a kind of — Printed circuit board. A printed circuit board.
5. Step 5. Printed circuit board — is part of — Mobile phone. All of a phone's parts are soldered onto a printed circuit board.
6. Step 6. 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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