A skinned knee and a continent rescued

Born in Texas, David grew up on a Kansas farm. One day as he was running home from school, he fell and skinned his knee. Three days later, it hurt too badly for him to do his daily chores at the barn, so while the rest of the family went to church, he remained behind.That evening, his leg was so badly swollen that his parents had to cut his shoe off his foot.His mother quickly sen...