Riddle: If someone were to write a biography about us, the following could be reported: #1 - Many famous people have sung about my type of ribbons over the years. #2 - My type of fever often occurs in children, ages 5 to 15. #3 - According to the book of Isaiah in the Bible, "Though your sins be as me, they shall be white as snow...." #4 - Rhett loved me, but did I love Rhett? Unfortunately, the answer was lost, as it went with the breeze. #5 - Author Nate H. wrote a famous book about my type of letter in 1850. Based on the biographical information above --- Who/what are we?