There is no such thing as knowledge. The closest we come is educated guesses. With 'reality' the moving target it is, the vagaries and ambiguities of our five senses, the mechanisms that process what they percieve, the language sytems developed from them, and not to mention varying levels of educated-ness... of course our mileage will vary!
-Bun Thit Nuong (Grilled pork on vermicelli)