Dumbbell and telephone: what they have in common

1. Step 1. Dumbbell — is made of — Stone. Greek halteres were stone dumbbells.
2. Step 2. Stone — is material for — Stadium. Ancient stadiums had stone stands.
3. Step 3. Stadium — has part — Public address system. Sound.
4. Step 4. Public address system — has part — Loudspeaker. Loudspeakers.
5. Step 5. Loudspeaker — is part of — Telephone. The earpiece reproduces the other person’s voice.

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