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'x + y' and 'y + x' are equivalent.
'(x + y) * (x - y)' and 'x^2 + y^2' are not equivalent.
'(x + y) * (x - y)' and 'x^2 - y^2' are equivalent.
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
Results (576 votes). Check out past polls.