Have you ever been tempted by a wildly boastful advertisement to buy a product, only to find that it is not as good as you were promised? Do you often feel irritated and blame another party or person because of media reports, only to find that the reports were distorted? The information from the outside world is abundant and complicated, and it is often hard to distinguish truth from falsehood. If you merely listen to one-sided stories from outside sources, you will be taken advantage of. Therefore, it is important to learn how to make your own judgements. This book will teach you how to use critical thinking to discover the truth.