Subliminal Message

Dear Dad,

$school I$ really great. I am making lot$ of friend$ and $studying very hard. With all my $tuff, I $imply can't think of anything I need, $o if you would like, you can just $end me a card, a$ I would love to hear from you.

Love,
Your $on

The Reply
Dear Son,

I know that astronomy, economics, and oceanography are enough to keep even an honor student busy. Do Not forget that the pursuit of knowledge is a Noble task, and you can never study enough.

Love,
Dad