Usenet and freezer: what they have in common

1. Step 1. Usenet — uses — Modem. The first nodes were linked by modems.
2. Step 2. Modem — uses — Bit and information theory. It encodes bits as sound.
3. Step 3. Bit and information theory — uses — Entropy. Shannon’s information entropy.
4. Step 4. Entropy — is a kind of — Thermodynamics. The second law.
5. Step 5. Thermodynamics — is used in — Vapour-compression cycle. Thermodynamics describes the cycle.
6. Step 6. Vapour-compression cycle — is used in — Freezer. The vapour-compression cycle produces the cold.

Open Evothings