Edward Witten:
>So where where we've made progress that's been in the string slash M theory framework where a lot of interesting things have been discovered. I'd say that there's a lot of interesting things we don't understand at all.
Graham Farmelo:
>But you’ve never been tempted down the other route. The other options are not.
Edward Witten:
>I’m not even sure what you would mean by other routes.
Graham Farmelo:
>Loop quantum gravity?
Edward Witten:
>Those are just words. There aren’t any other routes
>So where where we've made progress that's been in the string slash M theory framework where a lot of interesting things have been discovered. I'd say that there's a lot of interesting things we don't understand at all.
Graham Farmelo:
>But you’ve never been tempted down the other route. The other options are not.
Edward Witten:
>I’m not even sure what you would mean by other routes.
Graham Farmelo:
>Loop quantum gravity?
Edward Witten:
>Those are just words. There aren’t any other routes
