This was excellent. I learned so much. I kinda knew about the diphtheria outbreak in Nome and serum run from close to Fairbanks, Alaska, - 674 miles - but I never understood the conditions it was carried out in. I now know why Togo and Balto and their owners are considered heroes. It was an epic undertaking. I picked it up because the Iditarod started this weekend and learned that it also follows much of the original route.