Musket and electric motor: what they have in common

1. Step 1. Musket — evolved into — Rifle. A rifled gun.
2. Step 2. Rifle — has part — Rifling. Rifling.
3. Step 3. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
4. Step 4. Angular momentum — is used in — Reaction wheel. Conservation of angular momentum.
5. Step 5. Reaction wheel — has part — Electric motor. An electric motor spins it.

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