Need To Know Black swan events
What is the 'black swan' theory and how has it impacted U.S. elections? Details
Program: Need To Know
Episode: Black swan events
Need to Know's Jeff Greenfield explains how so-called "black swan" events sometimes have the power to swing U.S. presidential elections one way or another.
Premiere Date: 09/07/2012
Episode Expires: Thu 07 Sep 2017
TV Rating: NR
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