1. Judging from your other posts, I think you've already figured this out.
2. Yes, everything does. It depends on what you are doing on the phone, what apps you're running, etc.
3. Yes. You will still have them and you can still download/install more.
4. Yes. It doesn't take features away, it adds to them.
5. Yes, something could go wrong, but you can just restore the iPod to factory settings if it does.
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And all the science, I don't understand. It's just my job 3 nights a week.
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