Surfactant prevents this collapse by reducing the surface tension of the fluids that line the lungs and helping to equalize the pressures between large and small air spaces. Surface tension is a measure of the attraction molecules of a fluid have for each other.
Buffalo Bill Cody, who later became famous for his Wild West Show, was a rider for the Pony Express and wrote of his experiences. We join Bill's story as he is hired - at the age of 15 - to ride a section of the trail that lies in modern-day Wyoming:
Pony Curtis is the teenage narrator and protagonist of the novel. When his parents were killed in a car accident, Darry, his twenty-year-old brother, began to provide for him. He resents Darry s bullying manner, not realizing that he does so because he loves him and wants him to make something of himself.