Hash function and sewage treatment plant: what they have in common

1. Step 1. Hash function — is used in — Blockchain. Blocks are linked by hashes.
2. Step 2. Blockchain — uses — Internet. A peer-to-peer network.
3. Step 3. Internet — is used in — Cloud computing. Access over the Internet.
4. Step 4. Cloud computing — uses — Data centre. The cloud is data centres.
5. Step 5. Data centre — is made of — Concrete. The building is concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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