Numbers can be fun and very interesting.

I am a fan of The Long Tailhref="http://www.thelongtail.com/the_long_tail/2006/04/an_apparent_lon.html">The Long Tail: An apparent Long Tail paradox The paradox is cool and the way he explains it, makes it clear. In grad school, we used to look at what we called the inverted J-curve. If you plot kids and discipline incidents, you get this curve-- a few kids cause lots of problems but most kids don't cause any. The long-tail distribution provides a good explanation for lots of web-related phenomena where there are lots of choices for people. Its a quick, good read.