First aid kit and gyroscope: what they have in common

1. Step 1. First aid kit — has part — Tourniquet. A tourniquet.
2. Step 2. Tourniquet — has part — Screw thread. Petit’s tourniquet was tightened with a screw.
3. Step 3. Screw thread — is used in — Rifling. Helical grooves.
4. Step 4. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
5. Step 5. Angular momentum — is used in — Gyroscope. The rotor keeps the direction of its axis.

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