Hash function and dewar flask: what they have in common

1. Step 1. Hash function — is a kind of — Cryptography. Cryptographic hashes.
2. Step 2. Cryptography — is used in — Colossus. It broke the Lorenz cipher.
3. Step 3. Colossus — has part — Vacuum tube. About 2,500 vacuum tubes.
4. Step 4. Vacuum tube — uses — Vacuum. Electrons fly in an evacuated bulb.
5. Step 5. Vacuum — is used in — Dewar flask. A vacuum.

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