Explosive charge and shaduf: what they have in common

1. Step 1. Explosive charge — is part of — Grenade. The charge.
2. Step 2. Grenade — is made of — Clay. Medieval grenades were ceramic vessels.
3. Step 3. Clay — is material for — Yo-yo. Greek yo-yos were terracotta.
4. Step 4. Yo-yo — has part — Rope. A thread.
5. Step 5. Rope — is used in — Well. Water was raised with a bucket on a rope.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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