MRI and sonar: what they have in common

1. Step 1. MRI — is made of — Helium. The magnet is cooled with liquid helium.
2. Step 2. Helium — is used in — Airship. After the Hindenburg — helium.
3. Step 3. Airship — has part — Propeller. Air propellers.
4. Step 4. Propeller — is part of — Submarine. A propeller.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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