1. Black-americans come in last in all standardized tests. Asian-americans do fine on all the tests so it's not due to cultural bias in the tests.
The fact Asian Americans do fine doesn't mean there isn't cultural bias... it could just mean that the cultural biases tend to favor them as well, or that Asian Americans are so brainy as to more than overcome the biases.
Africa is by far the poorest and most backward continent on the planet
Keep in mind that's a snapshot of history. If you took another moment in time, in the hundreds of thousands of years that the various peoples have existed, you could come come up with a very different result. For example, let's look at 2500 BCE. Africa was the least backward continent on the planet, with the Egyptians having recently completed the Great Pyramid, which would stand as the largest structure built by man for over 3800 years. Africa housed the world's most sophisticated agriculture, writing, economics, government, theology, technology, art, etc. Meanwhile, northern Europe was one of the most backwards places in the world. The height of technology among the European primitives was setting some big rocks upright. If we'd had this discussion in 2500 BCE, one might have believed that history -- with centuries of increasingly sophisticated civilization in north Africa and no discernible progress among the savages of northern and western Europe -- demonstrated the racial inferiority of light skinned people. Of course, now we know that was just an accident of history -- the result of a particular run of events leading up to that snapshot of time in the long history of anatomically modern humans. Why assume any different about Africa today?
3. No black has ever won a Science Nobel Prize unless you count one in 1979 for the semi-science of economics. They have won many nobels in non-brain fields like Peace and also in Literature so it is not due to racism.
The peace and literature prizes also are for brain fields. You don't write a novel by force of physical exertion. For that matter, so are plenty of fields for which Nobel Prizes aren't awarded, such as music. Much of the musical progress of the 20th century was driven by African Americans, including the breakthroughs of jazz, rock & roll, soul, blues, and rap.
Out of 1552 chess grandmasters in the world, only THREE are black.
Chess is a great example of how important culture is to the distribution of such accomplishments. If you check that list of chess grandmasters, you'll find a vastly greater per capita assortment of Russians than, say, Chinese. Is this because the Russians are that much smarter? Or could it be because the game is just a lot more popular there?
Or, to take another example that may underscore the issue for you better, given you racial sensitivities, consider this: Morocco, in Africa, has 45 titled chess players (master or grandmaster), with a total population of 36 million. Japan has 26, with a population of 127 million. Are Moroccans just that much smarter than Japanese? Nigeria and Tunisia also have more titled chess players than Japan. Even Uganda has more titled players, per capita, than Japan. In fact, it isn't even close: 1 for every 2.2 million Ugandans, versus 1 for every 4.5 million Japanese. Are the Japanese just that much less brainy than the Ugandans? Or could it have something to do with where chess is popular?
Consider the same list if, instead of chess, we used Go, which is similarly an intellectually demanding strategy game. You'd conclude people of European ancestry were brainless. Or, for that matter, what about Oware players? Are white people just stupid, or could it have to do with where the game is popular?
http://www.oware.org/all_rankings.asp?subcat=4
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