Since the dawn of time, human survival has depended on how well we could avoid danger. This is only one theory of why human brains are set up with a "negative bias." negative bias is when negative events, emotions, or thoughts are equal in intensity to positive ones, but have a bigger effect on our state of mind. Scientific studies have concluded that in our mind, five positive things equal one negative.
These Forever stamps are always equal in value to the current First-Class Mail® one-ounce price.