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Staying positive is difficult for humans because our DNA is hardwired to hold on to negative experiences over positive ones, for sheer survival. Way back when our species was in survival mode, it was far more important to know and remember that the big furry animal with claws and teeth would kill you than it was to know and remember that the butterfly was pretty. It was more important to remember which berries would kill you than which ones were tastiest. We developed a survival instinct that is ingrained in a negative mindset.
