One of the thrilling parts of being on Mount Rushmore this summer was that I got to meet the last surviving worker on the monument, 91-year-old Nick Clifford. Nick was a driller and also part of the famous Mount Rushmore baseball team, consisting of the workers. He was tickled that I had written a book about Lincoln Borglum, who he said was a gem of a guy. He felt it was high time someone told Lincoln's story. This is what I love about nonfiction: all the people involved in every amazing story.