LED lamp and plumbing: what they have in common

1. Step 1. LED lamp — evolved from — Incandescent light bulb. It replaced incandescent bulbs.
2. Step 2. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.
3. Step 3. Oil lamp — is made of — Clay. Later — clay ones.
4. Step 4. Clay — is material for — Plumbing. Minoan plumbing used ceramic pipes.

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