AES cipher and incandescent light bulb: what they have in common

1. Step 1. AES cipher — is a kind of — Cryptography. A cipher.
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 — is made of — Tungsten. The cathode is a tungsten filament.
5. Step 5. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).

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