Dr. James Zimring, professor, medical researcher and author of the books What Science Is And How It Works and Partial Truths-How Fractions Distort Our Thinking, describes how the form of a simple fraction can be used as a conceptual framework to understand errors that we commonly make in our thinking. Many aspects of critical thinking are discussed, including: heuristics and biases, the advantages and disadvantages of our human tendency to perceive patterns, the primacy effect, the power of disconfirmation and what we can do to minimize errors in our thinking.