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my $a = ;
my $b = [ $a ];
push @$a, $b;
# Now $b contains a reference to $a and
# $a contains a reference to $b.
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 (540 votes). Check out past polls.