A student wrote letter to his home:
Dear Dad!
This $chool i$ really great. I am making lot$ of friend$ and $tudying very hard. Mathematic$, a$tronomy, and economic$ are the $ubject$ I like. With all my $tuff, I $imply can’t think of anything I need, $o if you would like, you can ju$t $end me a po$t card, a$ I would love to $ee $ome word$ from you.
$end it to me $oon,
Your $on
A week later he received a letter from home:
Dear Son!
I kNOw that trigoNOmetry, astroNOmy, and ecoNOmics are eNOugh to keep even an hoNOr student busy. Do NOt forget that the pursuit of kNOwledge is a NOble task, and kNOw that NO one can ever learn eNOugh.
Love,
Dad