Chapter 1 What is Critical Thinking? This book isn''t about what to think. (That''s up to you!) It''s about how to think. The Big Idea Critical thinking is the process of carefully evaluating ideas and facts to make decisions about what to believe and do. Critical thinking is a skill--like learning to skateboard or do algebra. The more we practice it, the better we get. "Wait. I thought being "critical" is a bad thing." Not always.
The word critical has a few different definitions. In this case, critical means to use careful evaluation or judgment. And in The Information Age, thinking critically is more important than ever. Time to Think Some adults can live their whole lives without ever learning this important skill. The good news? It''s never too late to think critically. And you get a gold star for starting now! Critical Thinking in Action It''s easier to understand the process with an example. In 1973, the United States government passed a law called the Endangered Species Act. Since then, more than 1,600 animal species have been protected by the law, including bald eagles, grizzly bears, humpback whales, and many plants and insects.
Deciding which animals should be added to or removed from the list is rarely easy. Often people disagree about the issue. Ultimately, Congress makes the decision after getting input from experts. Recently, Congress studied whether gray wolves should be on the endangered list. One hundred years ago, gray wolves were hunted so intensely that there were hardly any left in the United States. After the Endangered Species Act was passed, gray wolves were added to the list of protected animals. (This meant it became illegal to hunt wolves, because there were so few left.) Since that time, wolf populations have recovered, and there are now more than 6,000 wolves in the lower 48 states.
Now that the wolf population has grown, some people would like to remove the wolf from the endangered species list. Others think wolves should stay on the list. Imagine you are a member of Congress and must decide how to vote. Start by going through the critical thinking process: ? Ask questions. ? Who wants to remove the wolves from the Endangered Species list? Who wants to keep them on the list? ? How many wolves live in the United States? Is this a big or small number? ? What happens when an animal species is removed from the endangered species list? ? Gather evidence. ? Interview people who live near wolves, including farmers, ranchers, and forest rangers. ? Interview people who study wolves. ? Research the topic using the library, books, or the internet.
? Evaluate evidence. ? Check the facts. ? Analyze the data. ? Look out for logical fallacies. ? Test assumptions and be open minded. ? Are wolves always dangerous? ? How often do wolves kill livestock? ? Will removing the wolves from the list really be bad for wolf populations? ? Reach a conclusion. ? Decide whether wolves should stay on the list or be removed. ? Discuss and debate other points of view.
Chances are, you''re not a member of Congress (yet!), and you probably don''t have to make a decision like this anytime soon. But, whether you realize it or not, you still use critical thinking every day. Thinking critically isn''t always easy. Sometimes it''s easier to take shortcuts instead of going through the whole process. Let''s say you walk into your classroom one day and discover you have a substitute teacher. Like many people, you might take one of these unfortunate shortcuts in your mind. Unfortunate Shortcut #1: Stereotypes "Uh oh. Ms.
Sharpe looks pretty old. I bet she''s mean." A stereotype is a mistaken belief about a whole group of people that''s based on how they look or on your limited experience with them. The belief that older people are mean or grumpy is a stereotype. Unfortunate Shortcut #2: Fear "Oh no! Our last sub embarrassed me in front of the whole class!" Sometimes our fear is based on past experiences. But whether our fears are based on real dangers or not, fear can get in the way of clear thinking. Unfortunate Shortcut #3: Blind Faith "My sister told me all about Ms. Sharpe.
She doesn''t care if you leave class without asking." Someone acting on blind faith assumes he knows all the facts or has all the information he needs. He doesn''t take time to think about the possibilities or what the consequences of his beliefs might be. Unfortunate Shortcut #4: Ignorance "If she''s a sub, she can''t know anything about math." Ignorance, or a lack of knowledge or information, makes it difficult to make good decisions or come to thoughtful conclusions. Unfortunate Shortcut #5: Jumping to Conclusions "A sub? Mr. Chang must be in the hospital!" Drawing a conclusion without all the facts can lead to wrong conclusions or poor decisions. Critical thinking is a process that can be used in ordinary, everyday situations in our own lives and bigger, more complicated issues that affect a lot of people.
It isn''t always a fast process. Sometimes it can take years to reach a conclusion about a certain belief or action. And even then, with new information or experiences, those beliefs can change. Check out some of the beliefs from the past that required critical thinking and changed over time. Magic Mud Hundreds of years ago, people believed frogs were magically formed out of mud! They called it "spontaneous generation." People believed this because every spring frogs would seem to suddenly appear in ponds and puddles. (You might say they were jumping to a conclusion.) But when people started to study frogs more closely, they realized that frogs actually came from eggs that turned into tadpoles, and then adult frogs.
No magic there. Miracle Water Today we think of sparkling water as a refreshing drink, but at the turn of the 20th century, people thought it was medicine! Back then, doctors didn''t know very much about what caused or cured illnesses. Some people noticed that when they drank water that came from a spring (and sometimes that water was naturally bubbly), they seemed to feel better. Some people took advantage of this and started selling the water as a miracle cure. We know now that there was nothing miraculous about the water. At the time, many people didn''t have reliable indoor plumbing or safe water, so when they drank some of this "miracle" water, not surprisingly, they felt a lot better! DIY Gold Wouldn''t it be great if you could take something ordinary and turn it into gold? That''s what alchemists thought too. Beginning in ancient times, alchemists thought it was possible turn a common metal, such as iron, tin, or copper, into a precious metal, such as gold or silver. It took hundreds of years--and a lot of chemistry--to discover that sadly it wasn''t actually possible.
Clever Chimps For many years people believed humans were the only animals who used tools. For some people, this was important, because they believed it proved humans were better than animals. But in the 1960s, a young researcher named Dr. Jane Goodall studied chimpanzees in the wild. She was the first person to observe that chimps use tools too! Many people were not happy with Dr. Goodall''s discovery. But since then, scientists have learned that other animals use tools too, including birds and even fish! (Find out more about Dr. Jane Goodall on page 50.
) Quiz: What Kind of Thinker Are You? You already use critical thinking skills every day. Take this quiz to learn more about your thinking style. 1. Good news! Your parents just agreed your family can adopt a pet, but they don''t know which animal to get. The first thing you do is: a. Ask your friends for their opinions. b. Do an internet search for all the adoptable pets in your town.
c. Let your sister pick. She has good ideas. 2. You''re working on a group project for school. Two of your group mates get into a disagreement about how to present the project. You: a. Ask your teacher for her opinion.
b. Remember that one of your group mates did an awesome presentation last semester and decide it''d be best to go with her idea. c. Listen to both classmates before giving your opinion. 3. You see a news clip of a march happening in Washington, D.C. Your first thought is: a.
"Why is this on the news?" b. "I heard my parents talking about this." c. "I wonder why these people are marching?" 4. A classmate invites you to his birthday party next weekend, but you''re not sure if you should bring a gift. You: a. Ask him. b.
Talk to other people who are going to the party to see if they''re bringing gifts. c. Decide to bring a gift anyway. You might be the only one but your classmate will like it no matter what. 5. Your favorite T-shirt is missing. Your younger sister has always liked it, but you don''t remember her asking to borrow it. You head straight to: a.
Your desk chair. Maybe you can sit and think about the last place you saw it. b. The laundry room. Maybe it''s being washed. c. Your sister''s room. Maybe she borrowed it or knows where it is.
Or not. 6. Your friends have a great idea for a Halloween g.