A bias is a tendency. Most biases—like preferring to eat food instead of paper clips—are helpful. But cognitive shortcuts can cause problems when we're not aware of them and we apply them inappropriately, leading to rash decisions or discriminatory practices. Stereotype threat, for example, is the confirmation of negative stereotypes about another person's race, gender, group, and so on. Relying on biases but keeping them in check requires a delicate balance of self-awareness.