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:
Main . The seven preteen female ponies are sometimes referred to as the 7 Pony Friends. Starlight (ã¹ã¿ã¼ã©ã¤ã SutarÄito) Voiced by: Arisa Ogasawara Starlight, a pink pony with golden-yellow hair, is the sensible and responsible leader of the group. She regards school teacher Miss Hackney highly and aspires to become a teacher herself.