What goes on under the hood at Wolfram Alpha is a mystery to my simple mind, but after seeing the results of this search, I hope whatever it is gets an overhaul quickly.
You see, tipster Jon-Paul snagged this screen shot of his search for "dumb" (which I cropped to cut out his desktop, fyi).
I then did a search of my own to dismiss any Photoshopping concerns. The results were the same in each case: Racist synonym trees that associated the word dumb with black.
What the heck, Wolfram? [Wolfram Alpha - Thanks, John-Paul]