Duralumin and headphones: what they have in common

1. Step 1. Duralumin — is material for — Airship. The frames of zeppelins.
2. Step 2. Airship — uses — Helium. After the Hindenburg — helium.
3. Step 3. Helium — is material for — Geiger counter. It is filled with an inert gas.
4. Step 4. Geiger counter — has part — Loudspeaker. Clicks for every particle.
5. Step 5. Loudspeaker — is part of — Headphones. Miniature drivers.

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