Might explain why all the other races outside of Africa became more capable of producing civilization? Neanderthal had a early part in
-Hunted of larger animals with more advanced spears, more developed flint heads that were far more advance than anything that had developed in Africa.
-Developed "clothe" to stay warm--- unlike Africans that didn't need to as it was a more tropical environment.
-Cared for their elders and buried them.
-Higher meat diets as unlike the tropics, fruits couldn't be counted on most of the year. Higher protein based diets= May of lead to a increase in brain development???
This with the climatic forcing being placed on our species probably lead to our differences.
A few idea's I've thought of.