Bipolar disorder is a chronic mental illness that causes dramatic shifts in a personâs mood, energy and ability to think clearly. People with bipolar have high and low moods, known as mania and depression, which differ from the typical ups and downs most people experience.
Polar bears are the largest of the three bears found in North America. They range from about seven hundred pounds up to about fifteen hundred pounds. Not only are they the largest bear found in North America they are also the most dangerous to humans.
By population, the United States of America is the third largest country in the world, a long way behind China (1.4 billion) and India (1.28 billion). Its most populous states are California (39 million) and Texas (27.2 million), and its most populous city is New York City (8.2 million).