What does free mean?

I don't have very many, but the ios/droid app marketplace is interesting with all the free apps.  I find myself hesitating to pay money for an app, even though having it would be quite useful and I get that the person who wrote it is trying to make a living.  I'll drop $2 on a cup of coffee, but resist paying 99 cents for a app I know I'll use?

The I saw this article about trying to monetize blogging and was taken by this quote:

If you are not paying for it, you’re not the customer; you’re the product being sold.

 Interesting thought now when loading a free app.  Do you wonder who is buying you?

Using the brain to develop decision algorithms

There is not enough information in this article to know the details, but the inventor of the PalmPilot has a new venture to model decision making.

College football decision trees

Here's a nice little article on using decision trees to predict football outcomes.  Thanks JD!

Math music video

This is a little weird, but kind of cool.  Songs about Mandlebrot Sets:

Jonathan Coulton - Mandlebrot Set