Ice skates and radar: what they have in common

1. Step 1. Ice skates — is made of — Bone. The first skates were horse bones with a polished side.
2. Step 2. Bone — is material for — Flute. The oldest flutes (Hohle Fels) were carved from bird bone and ivory.
3. Step 3. Flute — uses — Sound wave. Sound.
4. Step 4. Sound wave — is used in — Echo sounder. A sound pulse.
5. Step 5. Echo sounder — evolved into — Sonar. Echolocation.
6. Step 6. Sonar — works like — Radar. The same echolocation principle: sound in water instead of radio waves.

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