Realize you won't master data structures until you are working on a real-world problem and discover that a hash is the solution to your performance woes.

Zero-length arrays are useful only in cases where you have a large structure, which contains a field of dynamic length, and you need to share that structure across program or even computer boundaries.

Mobile devices such as Android and the iPhone achieve their battery life largely because they can aggressively and quickly enter into and exit from sleep states. GPS prevents this.

Android's user-space is so different from stock Linux, you can easily say that Android is not in any way a Linux system, except for the kernel.