National Wildlife Magazine published a second article on Bigfoot in it's 1970 October/November issue.  While the attached article and clippings do not come straight from the National Wildlife archives, I'm confident that it is the actual article from 1970.    Polygraph examinations do not prove that someone is lying or telling the truth; this is why they are inadmissible as evidence.  If done incorrectly, they can put innocent people through hell - a faulty polygraph examination in Ger