WHAT MADE THIS WORLD "BIPOLAR"?

What made the world "bipolar"? was the question on Quora. Answered by Jack Wu M.D. from Duke University School of Medicine: "There is nothing "bipolar" about this world. Bipolar is a medical condition that involves a person's mood state continues to cycle from depression to euthymia to hypomania/mania back to euthymia and depression. The cycles just keep on going. It is a serious medical condition. Therefore I am not in favor of people using bipolar to describe anything outside the medical context. For example, some people would say, " Oh stock market has been going up and down recently. It is so bipolar.". I cringe when I hear descriptions like that".