When you double tap the Home button and see the apps that are running you can close them. I'm guessing the iPhone is like a mini computer, and those active apps running in the background are eating up memory and resources. It would stand to reason that you'd want to close any apps your not using to increase performance. However I noticed even after I power off my phone the apps are still running! Do background apps ever close, or do they have threshold / trigger that closes them? I don't imagine the only way to close them is manually. Is anyone familiar with the process?