Assault rifle and telescope: what they have in common

1. Step 1. Assault rifle — evolved from — Rifle. An automatic weapon.
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 — is part of — Space telescope. Pointing Hubble.
6. Step 6. Space telescope — is a kind of — Telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.

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