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Bad things happen. And the human brain is especially adept at making sure that we keep track of these events. This is an adaptive mechanism important for survival.

"Human Memory: Why Bad Memories Stick" by David Perlmutter, www.huffingtonpost.com. January 17, 2011.
Bad things happen. And the human brain is especially adept at making sure that we keep track of these events. This is an adaptive mechanism important for survival.