This may be offputting for many, but i wondered if anyone has any theories (be they only theories or backed with scientific reason) as to why mixed race children, generally speaking, posess a 'hardiar' disposition in regards to sickness and a higher I.Q than white children. Tests have been done as to whether the said children where raised by white parents or black parents or one of each, yet the overall result is mostly the same - a higher I.Q than whites.    Why?