One more question:
Can you get some sort of malware/virus from just downloading an app without opening it. I was trying to decide if the Nexus 7 would be a good device for my niece who likes barbie stuff. There was a free barbie app (Princess Barbie) and I stupidly installed without reading all the reviews. The reviews all talk warn not to download, the permissions say that it can access lots of personal information that I didn't want it to see. I never opened it, so I am still "safe" or not? Yes, I know, I am paranoid and stupid for downloading such an app.