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:
Teens who join the Pony Express include a young Wild Bill Hickok and `Billy' Cody (who grew up to be Buffalo Bill). The series took the usual liberties with history, and ran three seasons---twice as long as the real Pony Express. Ty Miller The Kid 36 Episodes (2017-2017)