Crossbow and plumbing: what they have in common

1. Step 1. Crossbow — evolved from — Bow and arrow. A bow on a stock.
2. Step 2. Bow and arrow — has part — Rope. The bowstring is a cord of sinew or fibre.
3. Step 3. Rope — is part of — Yo-yo. A thread.
4. Step 4. Yo-yo — is made of — Clay. Greek yo-yos were terracotta.
5. Step 5. Clay — is material for — Plumbing. Minoan plumbing used ceramic pipes.

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