Not really. It's hard in the "NP hard" sense, not the "calculus is hard" sense. We don't have answers and there probably aren't any.

The best you can do is cross-reference everything you know, take into account the degree to which you can verify each thing independently, and try and come up with some correlations between different sources to establish a web of credibility.

Unfortunately, experience has shown that regular humans just don't do this.