(May 7, 2011 at 2:32 pm)Watson Wrote: I am not aware of any human being on this planet currently who can say they are 'absolutely sure', can say that they 'know' for sure about anything.
It's impossible to know something as an absolute, granted.
But you CAN come to a conclusion of reasonable certainty about things.
As for the topic in question, human nature, there is an entire field of scientific study on the topic. I believe it is called psychology...