AI all around us

For four months you've written programs that do exactly what you told them. Chapter 1 hammered this home: the computer follows instructions literally, never guesses, never uses common sense.

Your grade calculator gives the same grade for 85 marks every single time. That's not a limitation — it's the whole point. You can predict its output before running it.

AI works differently. It wasn't given rules. It was shown thousands of examples and worked out its own pattern — and it guesses.

Here's the split that matters:

• Traditional programs — a human writes the rules. if mark >= 90: grade = "A". You can read the rule, predict the output, and point at the line responsible for any answer.
• AI — nobody wrote the rules. The system was shown many examples and found patterns itself. Nobody can point at the line that decides.

That second part is genuinely strange, and worth sitting with. When an AI gets something wrong, there's often no single line to fix — which is exactly why "fix the cause, not the symptom" from Chapter 6 becomes so much harder.