Another fun of order of operator. -1^2 -1^2 = ?
For compatibility, I can understand why LibreOffice and Gnumeric have the same answer with Excel. But Yahoo is more close to Microsoft than I thought ^_^

Excel 2003 -1^2 -1^2 = 0
LibreOffice Calc 2.4.5 -1^2 -1^2 = 0
Gnumeric 1.10.16 -1^2 -1^2 = 0
Yahoo -1^2 -1^2 = 0

Google 1^2 -1^2 = ((1^2)) - (1^2) = -2
Matlab 7.10.0.499 (R2010a) -1^2 -1^2 = -2
QtOctave 3.2.4 -1^2 -1^2 = -2
Freemat 4.0 -1^2 -1^2 = -2
Scilab 5.4.0alpha -1^2 -1^2 = -2
Sage -1^2 -1^2 = -2
Python 2.7.2 -1**2-1**2 = -2
Mathematica 8.0 -1^2 -1^2 = -2
wxMaxima 5.25.1 -1^2 -1^2 = -2
R 2.11.0 -1^2 -1^2 = -2
magma (website calculator) -1^2 -1^2 = -2
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