Perceptron and stone tool: what they have in common

1. Step 1. Perceptron — has part — Potentiometer. Potentiometers set the weights.
2. Step 2. Potentiometer — is made of — Nickel. The resistance wire is a nickel alloy.
3. Step 3. Nickel — is material for — Stainless steel. Nickel in austenitic steels.
4. Step 4. Stainless steel — is material for — Cutlery. Stainless steel.
5. Step 5. Cutlery — has part — Knife. Knives.
6. Step 6. Knife — evolved from — Stone tool. The first knives were stone flakes.

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