Shower head and plough: what they have in common

1. Step 1. Shower head — is part of — Shower. A sprayer.
2. Step 2. Shower — uses — Plumbing. Plumbing.
3. Step 3. Plumbing — works like — Aqueduct. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.
4. Step 4. Aqueduct — is made of — Stone. Aqueducts are stone arches and channels.
5. Step 5. Stone — is material for — Hoe. The working part was of stone or antler.
6. Step 6. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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