Previous studies that suggested such a connection were often poorly designed, had dropout rates or did not control for factors that could affect the conclusion.
Many men and women have long bought into the idea that there are "male" and "female" brains, believing that explains just about every difference between the sexes.
DNA from any of the Bin Laden children in the compound could be compared with a sample from his sister, who died in Boston in 2010, to provide evidence that the family was present.
The irony is that if he completely accepted the fact that certainty doesn't exist, he would create the certainty he craves: he would be absolutely certain that certainty doesn't exist.