I think every version would be a bit much, especially on smaller drives if it had logarithmic diffs i.e. every change today. Every hour for the past week. Before that every day for the past month. etc. It would probably be more disk efficient for people with smallish SSDs, but everybodies "perfect" is different.
Yes, but doesn't google limit google apps to approved devices? If google wanted to they could probably use these to force OEMs to use the default UI or loose the right to distribute google apps. Of course, the article doesn't say that, so google probably isn't even doing that.
This is basically what I did in 8th grade, then in 9th grade I joined the FIRST robotics team in our high school, which I would strongly recommend if there is one available.
I've tried it a few times out of necessity in robotics pits ( http://usfirst.org/roboticsprograms/frc/ ). I've always found it enjoyable (except for the noise) , but I was normally doing quick changes. I think my max time was an hour and I didn't feel any noticeable pain/discomfort.
They've also done other competitions, such as robo-ops for college students (http://www.nasa.gov/centers/langley/news/releases/2011/11-08...) (https://www.wpi.edu/news/20112/rascalrob.html)