My inquiry question is: What is bipolar disorder? I ask this because I watched a movie where a man had this disease and was very happy at sometimes and very sad at others. I haven’t researched anything about it yet, but I have some prior knowledge that would help me with learning more about it. Bipolar disorder is when two poles, or two extremes, totally repel each other in your brain. These two extremes of the mind are called mania and depression.