Explanation

This site presents facts, statistics, and additional resources about the issue. The NIH is a governmental organization whose information is heavily researched and well documented (so the facts presented can be traced to other documents or reports).  The combination of these two factors indicate the authority of the source and the accuracy of the information.  Furthermore, they do not take a position on this issue.

This site presents facts related to the issue.  The information contained in the article is heavily researched and documented so the facts presented can be traced to other documents or reports and verified.  In terms of authority, Stand to Reason is a conservative Christian organization with strong beliefs against stem cell research.  While this does not indicate that they should not be considered an authority on this issue, their position is biased and might affect the way the information is presented.