i admired that in henry hampton's shop and eyes on the prize. we had a challenge because our mandate was to tell all american history. we had to go back to the 18 and 17 centuries. we avoided anything that was pre-archival because we did not know how to deal with it at the beginning. you can't find witnesses. one of our first shows was on the 1906 san francisco earthquake. we barely got a couple of people to make in a parents. as soon as we found them, we shot them immediately and put them in the back. we did not know if we were going to go ahead with this story. it was a real stretch for us. we had to challenge ourselves to go back into the 19th century and back into revolutionary periods. since we ared on talking about the archives his letters, diaries, first-hand accounts that could be employed in many different ways to recall the donner party. there is no first-hand witnesses to the donner party. >> they ate each other. >> one of our most successful films. we relied on diaries and letters. >> one of the things that is so impressive about wha