There's no 4 races, there a lot of "races" (scientists say there's at least 7 races in Europe) and I can personally tell which human come from south-west of France, from south-est, from Belgium, etc... Skin color is like a rainbow with every hues from white to black, and that's not the only "factor", skin is just an attribute matching the biotope. I followed biology studies which I dropped, but I'm very interested by human differences and read a lot of things on the matter and also on genetic genealogy but still never gave my cells to know more on my origins (I'm still not done with classical genealogy ^^).
PS : from what I've read "white people" reflect the most light in every wavelengths except for a small portion of the light specter where Asian reflect more.







