It’s rather strange how we sort other creatures into species, sub-species etc., but we only have ONE homo-sapiens.
Take cows, for instance: why Friesians, Guernseys and Jerseys??? They all have four legs and hairy coats.
Perhaps we should sort ourselves out by hair/eye/skin color, height, weight and attitude.
Then we might understand how Neanderthals got absorbed and their features subsumed.
An explanation for the Superman Syndrome?
http://en.wikipedia.org/wiki/XYY_syndrome