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It's also been shown that brain development and intelligence contribute to the ability to build a society where decent health care is available.
This is why niggers never created the wheel or a written language, or built a city with stone walls, or practiced agriculture, wove cloth, or domesticated animals before the Arabs taught them only a few hundred years ago.
Are they even human? The ability to interbreed means nothing. Dogs and wolves, housecats and bobcats, tigers and lions, horses and donkeys, can interbreed, yet are clearly different species.