Reaction wheel and plumbing: what they have in common

1. Step 1. Reaction wheel — uses — Angular momentum. Conservation of angular momentum.
2. Step 2. Angular momentum — is used in — Spindle. Spinning the spindle twists the thread.
3. Step 3. Spindle — is made of — Clay. The spindle whorl was shaped from clay or carved from stone.
4. Step 4. Clay — is material for — Plumbing. Minoan plumbing used ceramic pipes.

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