The trouble is, we are often asked to account for disparities in ability. For example, Lawrence Summers, president of Harvard was asked to comment on why there aren't more women getting degrees in math and sciences. He suggested that maybe women aren't as good at math and science as men. BAM! He is now about to lose his job.
And there is absolutely no way to get liberals to debate this rationally -- because they know they will lose.
well, everyone is different physically and mentally, so i dont think any scientist or professor can absolutely prove anything as far as that goes.