Tuberculosis (TB) Tuberculosis (TB) Active tuberculosis (TB) is very contagious. The World Health Organization (WHO) estimates that one-third of the world's population is infected with the bacteria that cause TB.
With an average elevation of 6,800 feet, Colorado is the highest state in the United States. A mountain lake outside of the skiers dreamland of Aspen, Colorado. The US is bordered to the north by Canada and Mexico to the South. With 50 states of varied sizes, US is considered the largest nation in America.
Mt Whitney - in the California Sierra Nevada is the highest peak in the continental United States. Reaching an elevation of 14,508 feet, it towers more than 10,000 vertical feet above the Owens Valley, and because of it's lofty position, it is the most sought after peak in all of North America.