Anvil horn and electronic calculator: what they have in common

1. Step 1. Anvil horn — is part of — Anvil. A cone for bending.
2. Step 2. Anvil — is made of — Stone. The first anvils were flat stones.
3. Step 3. Stone — is material for — Gutter. Ancient gutters were stone or ceramic channels.
4. Step 4. Gutter — is made of — Zinc. Galvanized steel.
5. Step 5. Zinc — is material for — Alkaline battery. The anode is zinc.
6. Step 6. Alkaline battery — is part of — Electronic calculator. A calculator runs on a battery, sometimes on a tiny solar panel.

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