Surfboard fin and internet: what they have in common

1. Step 1. Surfboard fin — is part of — Surfboard. The board’s fin.
2. Step 2. Surfboard — is made of — Fibreglass. Fibreglass.
3. Step 3. Fibreglass — is material for — Heat shield. Ablative shields are fibreglass with phenolic resin.
4. Step 4. Heat shield — is part of — Space Shuttle. Heat-shield tiles.
5. Step 5. Space Shuttle — is made of — Silica (sand). The heat-shield tiles are silica fibre.
6. Step 6. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.

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