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:
The youngest Kentucky rider was an African American teenager 15 years old by the name of Alonzo Lonnie Clayton. He ran many races between 1875 and 1902. On May 11, 1892 he bec â¦ ame the youngest rider to win in the Kentucky Derby.