The only way to know for certain whether differences in intelligence exist between sexes is to raise 100,000 fetuses in a lab with the exact same upbringing and education.  Oh and the education would have to be done by robots to avoid any bias from the teachers.  Oh and these people would have to be cut off from all popular media.  The point is that there's no practical real way to prove/disprove these differences.  I would imagine that if it were possible to do this experiment,  any differences would be negligible.  We should err on the side of caution and assume that bias does exist (and I think this article and the google engineer's manifesto lend credence  to the fact they do exist).  The arrogance in making such sure assumptions based on a handful of studies, cherry-picking the ones that don't prove your theory, and saying that you know for sure that "science" proves that men and women are inherently different in their abilities in STEM fields is staggering.