There are a number of kinds of knowledge: the first is what you read, of course this depends on how accurate the writer is, and based on all that we have experienced, your chances are slim to none – the second is observation, now there are two types of observation: there is physical observation and then there is mental observation – science is obviously the study of physical observation and we now know that everything we observe is only as Einstein said "an illusion, albeit a very persistent one" – so the only truth is what we can sense