Hook shank and sonar: what they have in common

1. Step 1. Hook shank — is part of — Fish hook. The rod to which the line is attached.
2. Step 2. Fish hook — is made of — Bone. Ancient hooks were carved from shell and bone.
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 — Echo sounder. A sound pulse.
6. Step 6. Echo sounder — evolved into — Sonar. Echolocation.

Open Evothings