The paper examines the lack of a clear definition of bias in library literature and critiques existing teaching methods that treat bias as inherently negative and easy to identify. It argues that identifying bias is a complex cognitive process involving recognizing types of bias, establishing an objective baseline, and assessing its impact. Drawing on insights from multiple disciplines, the paper proposes a clear definition of bias and a practical framework for evaluating it. The study emphasizes the need for a nuanced approach to teaching bias identification to better prepare individuals for evaluating information in a post-truth society.