Heat shield and router: what they have in common

1. Step 1. Heat shield — is part of — Space Shuttle. Heat-shield tiles.
2. Step 2. Space Shuttle — is made of — Silica (sand). The heat-shield tiles are silica fibre.
3. Step 3. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.
4. Step 4. Internet — has part — Router. A network of routers.

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