either you believe in adam and eve or you were once black
First off, what exactly is the debate, creationism vs evolution or something ? If that's the case, clearly on the evolution side here.
Second, you probably meant to say "some extremely distant ancestors of yours were black", not "you were once black".
But that would also be quite misleading, since they probably didn't look all that "black" at all, more like grey-bronze-ish. People you'd be likely to call "black" nowadays are almost as far off in all possible ways from those common ancestors as you and I are.
humans physical nature evolved and left the brains in the behind
See, now you're "off" again, and quite damn far off too.
If anything, the human brain is the part of all of us that has evolved the most in the time since hominids started existing, and it is now the most energy-consuming organ of the entire body : the human brain (barely 2% of body weight) consumes on average about 20% of the energy the body produces.
All humans on the planet now have noticeably more "brains" (purely size-wise) than those early hominids. "Ardi", female skeleton, 4.4 mil years old had a brain compartment of barely 300 ml ; "Lucy", 3.2 mil years old, brain compartment of around 400 ml ; Homo erectus, roughly 1.5 mil years ago, brain size of around 800 ml ; Homo sapien, starting barely 100k years ago, brain sizes around 1200 ml ; modern man, brain sizes up to 1500 ml.
Of course, large variations between individuals exist, and there's no direct link between any particular individual's brain size and its intelligence level, but there's a strong statistical correlation.
In 1955, Albert Einstein's brain was preserved for research. Three scientific papers have been published examining the features of Einstein's brain. Albert Einstein's brain differed to normal men's brain in that his brain had more glial cells per neuron that might indicate that neurons in Einstein's brain had an increased "metabolic need"-- they needed and used more energy.
Einstein's brain weighed only 1,230 grams, which is less than the average adult male brain (about 1,400 grams). The thickness of Einstein's cerebral cortex was thinner. However, the density of neurons in Einstein's brain was greater. In other words, Einstein was able to pack more neurons in a given area of cortex.
The most recent study concerning Einstein's brain was published in the British medical journal The Lancet, on June 19, 1999. They found that a portion of the brain that governs mathematical abilities and spatial reasoning -- 2 key ingredients to the sort of thinking Einstein did best -- was 15% wider than average allowing better connection between its cells, which could have allowed them to work together more efficiently.