Expert Thought

So confusing...is an expert someone that spends thirty- years actively doing and studying a specific topic or it is that lady the other day who told me she had been studying how bad vaccinations are for children on the internet for the last nine years...I wish there was something that would clarify all this...I don't know maybe a sense that is common to people...yea that is it...we can call it common sense...I think this is marketable. #randomthoughts