Dear Dad, 

$chool i$ really great. I am making lot$ of friend$ and $tudying very hard. With all my $tuff, I $imply can't think of anything I need, $o if you would like, you can ju$t $end me a card, a$ I would love to hear from you. Love, Your $on. 

Reply from dad... 

Dear Son, 

I kNOw that astroNOmy, ecoNOmics, and oceaNOgraphy are eNOugh to keep even an ho NOr student busy. Do NOt forget that the pursuit of kNOwledge is a NOble task, and you can never s tudy eNOugh. Love, Dad