There are currently more than 750 such areas in the National Wilderness Preservation System comprising over 109 million acres -- roughly 5% of the United States by area. Need a refresher from the other 95%? The Active Times picked 10 wild places in the lower 48 states that are truly wild.
Polio, which struck children disproportionately, could attack the central nervous system and cause muscle deterioration, paralysis and even death. American virologist Jonas Salk, who was born 100 years today on October 28, 1914, developed the worldâs first safe and effective polio vaccine.
Winnie the Pooh author AA Milne in January 1920Getty. AA Milne is known around the globe as the creator of one of the world's most beloved characters, Winnie the Pooh. What is less known about the author is that he worked for the British intelligence agency M1 7b. Yet the First World War veteran was a pacifist even before his involvement in the war.