ms. mcclafferty talks about the mount vernon estate set out to better understand what the first u.s. president looked like, different moments in his life. >> nonfiction books on wide array of topics from george washington to x-rays to marie curie to varian frye, an american holocaust rescuer to tech titans like bill gates and steve jobs and others peered so when i began a project they know very little about my topics and as i began to do the research, i sort of go on a treasure hunt. that's the way like to look at it. i use primary sources in order to gather the material to write nonfiction books that are not only accurate, but hopefully interesting as well. so when i began to look into this book about george washington and decided to write this book, i really began with george washington in the very same way. i knew very little about washington. i heard of course that he had shot down a cherry tree, which he didn't and i heard you were a week, which he didn't. and i heard that he wore wooden teeth, which he didn't. so i found that very quickly the things i thought i knew about georg