i mean, i worked and worked and worked on it being very danny kahneman-esque going back and forth -- my problem was, i had a couple big problems. one was i didn't know i could pull it off. i was a stranger to their field. i didn't, had never had as much as an introductory psychology course, and i was going to have to yet my mind -- get my mind writing around their position in the field. and i had to write about the early israel hi state. i can imagine a million people telling me exactly how i got it wrong after i published it. so i was reluctant. i made five trips to us rile. i made four trips of more than ten days each before i committed to do the book, that's how, how much kind of legwork i did before i even thought, yeah, i can do the book. but it was three years ago or so i finally said i'm doing it, and what i concluded was their story was so interesting, enough people thought it was important that someone was going to do it, and it was interesting enough that it justified doing it. and i thought that anybody who's going to do this is not going to have the access to the material