2. The following quotation is from Donald Rumsfeld, secretary of defense under Presi- dent George W. Bush from 2001 to 2006: Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns-the ones we don't know we don't know Discuss this quotation in the context of risk and uncertainty