First, you have to accept that any answer you come up with will be a probabilistic one. All experiences are filtered through our minds, and our minds are far from perfect reality detectors that can be in any sense of the word "certain," aside from some arguably self-evident philosophical certainties such as "I exist". While the word "personal" implies subjectivity, many people often confuse a personal experience with their interpretation of a personal experience that often includes objective cla. . . See the complete description at http://www.thedrboshow.com/tools/bg/Bo/TheDrBoShow