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:
Cover art by Jack Kirby and Dick Ayers. Rawhide Kid stars in The Bat Strikes!, The Twister!, Those Who Live by the Gun...., scripts by Stan Lee, pencils by Jack Kirby, inks by Dick Ayers. Trail of Long Ago text story, art by Joe Maneely. The Man Who Robbed The Express!, script by Stan Lee, art by Dick Ayers.