Here's a slightly modified version of your AlienFarm module... There are some subtle differences... Can you see what they are?

#!/usr/bin/perl -w
package AlienFarm;
use strict;

sub birth {
    my $pkg = shift;
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime
+(time);
    my $name = shift;
    $mon++;
    $year+=1900;
    my $birth = "$mon $mday, $year";
    my $alien = bless {
        NAME => "$name",
        BIRTH => "$birth",
        POWERS => [ ],
        BRAINS => ["pre-school", "1st grade", "2nd grade",
                     "3rd grade", "4th grade", "5th grade",
                     "6th grade", "7th grade", "8th grade",
                     "9th grade", "10th grade", "11th grade",
                     "12th grade", "Harvard Freshman", "Harvard Sophmo
+re",
                     "Havard Junior", "Harvard Senior", "Employed", "C
+EO"],
        LEVEL => "-1" }, $pkg;
}
sub birthday {
    my $decide=shift;
    ref $decide ? $decide->{BIRTH} : "an unknown time";
}
sub name {
    my $decide=shift;
    ref $decide ? $decide->{NAME} : "an unknown name";
}
sub set_power {
    my $self=shift;
    my $power=shift;
    push @{$self->{POWERS}}, $power;
}
sub get_powers {
    my $self=shift;
    my $num=1;
    foreach my $power ( @{$self->{POWERS}} ) {
    print "$num => $power\n";
    $num++;
    }
    print "\n";
}
sub teach_lessons {
    my $self = shift;
    $self->{LEVEL}++;
    return "Lesson taught. Level: ". $self->{BRAINS}[$self->{LEVEL}] .
+"\n";

}
sub schooling {
    my $self = shift;
    return $self->{BRAINS}[$self->{LEVEL}];
}
[download]

Also, you can actually combine set_power and get_power into one sub, called power. But that's an exercise left for the reader...

Theodore Charles III
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