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The first question I want to address, is why most of us have different perceptions about the world. Why it is hard to agree on things. I'll propose that if we will undestand how knowledge is constucted in the brain, we will have more understanding in the question.
Knowledge is our understanding and predicting the behavior of the world within us and around us. Each and every one of has have unique perception. How this perception is created and how it realte to the “real world” is the quest that epistemology has set before herself. Yet for more then 2500 years of epistemology, [[The Historircal overview of the phenomenological cage|nobody had found a reliable way to establish the relations of perception or knowing about the “real world” (Link to the history...)]]. To demonstrate the problem of knowledge, we may use the “brain in a vat” (Link to wikipedia) thought experiment. In this thought experiment, you are asked to find a reliable way to know if you really exists as you perceive it, or you are actually a brain in a vat, which gets it's sensory inputs from a computer, that simulate the perceived world.
Till today nobody was able to find a reliable answer to this question. People sometime suggest that Hillary Putnaham had found a way, but her conclusions say otherwise. (ref) she conclude that we can not distinguish between realty and virtual experience.