Seven decades after Pearl Harbor and one decade after 9/11 we Americans dare not remain willfully oblivious to the threat of the Black Swan. Our grand American experiment is more vulnerable now that it was in 1941 and it is certainly more precariously balanced than it was in 2011. These conundrums are what Donald Rumsfeld might describe as the "known unknowns" but by definition a Black Swan event is as surprising as it is earth shattering. So all of these threats which beset us are by definition not Black Swan events. They are known risks. There are many more risks...