Icelanders are extremely inbred. That, and their detailed genealogical records, make them an extremely valuable resource for genetic study. However, their life expectancy is quite high, probably more in correlation with their lifestyles than the detrimental effects of inbreeding. Humans as a whole are fairly inbred. "Mitochondrial Eve" only lived about 150,000 years ago, making us perhaps one of the most genetically homogenous species on the planet. And when you're genetically homogenous already, you don't notice the effects of inbreeding that much.
the only reason people have a problem with being 1/2 & 1/2, is because many people are too racist. Being 1/4, 1/4, 1/4 & 1/4 hasn't hurt Tiger Woods, or his chances with cute Swedish girls, see below: http://www.salon.com/april97/tiger970430.html http://www.cnn.com/2004/SPORT/10/06/tiger.marriage/ actually, we're all Africans; whites, Asians, blacks we all evolved from Adam & Eve, check below: http://edition.cnn.com/2005/TECH/science/04/12/genographic/
Did I say I say I was prejudice? Makes me wish I was Tiger Woods! Thanks for elaborating his ethic diversity. Really, I never had a clue! Your last citation makes me wonder how long in geological history (millions of years) that it takes for a species to diverge into another species so that they are no longer able to interbreed?
