I was reading this today in one of my emails and thought I would pass it on here.

But why is it that our brains are drawn toward what's annoying or negative more than what's pleasant and positive? And how can we rebalance this automatic nature of our minds? This is a tricky one. It's been well established that our brains have an automatic negativity bias. In the animal kingdom the magic rule was, as author of Just One Thing Rick Hanson puts it, Every day, eat lunch, but don't be lunch.€� Those people whose minds were not primed to immediately target danger didn't pass their genes on through the evolutionary chain. So our brains, over time, became more deeply ingrained with the bias toward focusing on threats and negativity.
An awareness of this bias alone can help you with the old adage "Don't believe everything you think."