Excel does "cosmetic" rounding, that ends up producing some surprising results - in the words of this author, it "confers supernatural powers upon some (not all

Excel does "cosmetic" rounding, that ends up producing some surprising results - in the words of this author, it "confers supernatural powers upon some (not all) parentheses": http://www.cs.berkeley.edu/~wkahan/Mindless.pdf http://www.cs.berkeley.edu/~wkahan/Mindless.pdf