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$x, $y, $z = (2,3,4); # $x = undef, $y = undef, $z = 4
($x, $y, $z) = (2,3,4); # $x = 2, $y = 3, $z = 4
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 (574 votes). Check out past polls.