Carbide lamp and internet: what they have in common

1. Step 1. Carbide lamp — uses — Acetylene. Burning acetylene.
2. Step 2. Acetylene — is used in — Headlight. The first headlamps burned acetylene.
3. Step 3. Headlight — uses — Reflection of light. A reflector gathers the light into a beam.
4. Step 4. Reflection of light — is used in — Endoscope. A mirror directs the light of a candle.
5. Step 5. Endoscope — has part — Optical fibre. Flexible endoscopes use optical fibre.
6. Step 6. Optical fibre — is part of — Internet. The backbones are optical fibre.

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