Skate blade and electrical telegraph: what they have in common

1. Step 1. Skate blade — is part of — Ice skates. A steel blade.
2. Step 2. Ice skates — is made of — Bone. The first skates were horse bones with a polished side.
3. Step 3. Bone — is material for — Flute. The oldest flutes (Hohle Fels) were carved from bird bone and ivory.
4. Step 4. Flute — uses — Sound wave. Sound.
5. Step 5. Sound wave — is used in — Phonograph. It records sound vibrations as a groove.
6. Step 6. Phonograph — was inspired by — Electrical telegraph. Edison came to the phonograph while working on recording telegraph and telephone signals.

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