CHAPTER 1

Introduction

This book is about commonsense reasoning, the sort of reasoning people perform in daily life. Here are some examples of commonsense reasoning:

1. In the living room, Lisa picked up a newspaper and walked into the kitchen. Where did the newspaper end up? It ended up in the kitchen.

2. Kate set a book on a coffee table and left the living room. When she returned, the book was gone. What happened to the book? Someone must have taken it.

3. Jamie walks to the kitchen sink, puts the stopper in the drain, turns on the faucet, and leaves the kitchen. What will happen as a result? The water level will increase until it reaches the rim of the sink. Then the water will start spilling onto the floor.

4. Kimberly turns on a fan. ...

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