Poorly written articles  factual errors. I downloaded the simple version and was disappointed to find that most of the articles were written from a Christian rather than scientific point of view  often blatantly excluding fact. The articles were poorly written  which makes it seem like they were some sort of religious high school project. I had hoped to download the full version to see if it contained different articles  but the links appear to be broken  at least from my Nexus 6P.
November 15 2015