Eclipse Debugger

Eclipse has a debugger which is very cool and interesting, I guess other IDE has similar functions too. This is very neat to see how your code actually flows, very helpful to me for helping me understand programming and the what happens at each steps. I never though that was possible. This is cool as I'm learning recursion, it allows me to follow through some of the logic.
Recursion is awesome because you can continue to call the function until it solves your problem. It's interesting that there is base code and recursive code.