This is very simple. Two people, experts included can have varying answers to a question and both can be right. Both could even say the same thing but with different words and the perception of their answers could be constrewed by others as different. Now the fact remains that unless your question is 100% without a doubt proven to have only one answer than people will always have their own opinions. Take two Professors of any college subject. They can debat all year over a question in their field and have two completely different takes on that subject even though it is written only one way in their subject books. PERCEPTION and OPINION !!!!!!!!