Web browser and LIGO: what they have in common

1. Step 1. Web browser — uses — World Wide Web. It displays web pages.
2. Step 2. World Wide Web — uses — Internet. The web runs on top of the Internet.
3. Step 3. Internet — is made of — Silica (sand). The backbones are silica optical fibre.
4. Step 4. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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