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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.
Throwing nuclear weapons into the sun
Making everybody on Earth disappear
A threat from an alien with a mighty robot
A new technology or communications medium
Providing a magic fish to a Miss Universe
Establishing a Group mind
Results (166 votes). Check out past polls.