Nail polish and radio: what they have in common

1. Step 1. Nail polish — works like — Celluloid. Both are nitrocellulose: celluloid is a solid plastic, the polish is a solution of it that dries into a film.
2. Step 2. Celluloid — is material for — Polarizing filter. Land’s Polaroid is aligned crystals in a film.
3. Step 3. Polarizing filter — is part of — Liquid-crystal display. Polarizers.
4. Step 4. Liquid-crystal display — is part of — Pager. The message appears on an LCD.
5. Step 5. Pager — uses — Radio. Radio reception.

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