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.
How many people live in the United States? As of July 2013, the population of the United Stated was estimated to be just over 316 million people. In October 2014, the U.S. Census Bureau estimated that the population had surpassed 319 million.