Not much research, not many conclusions, so hard to say. There could be accommodation issues but more likely only if you're using VR >10 hours/day. And as I pointed out elsewhere in this thread, lightfield displays will eventually fix the accommodation issues.
Okay, so I haven't published anything on this, but I have asked several optometrists explicitly. They have all said that the worst that can happen is you get a headache from eyestrain the first few times you use it, that you might feel tired, but ultimately it goes away, there is no chance for permanent damage. Their view was that the muscles tire out, that you can't strain them to the point of injury, and it just becomes uncomfortable and unworkable, but not damaging.
Just double checked because I didn't believe what you said about the highest grossing game. The top grossing games on iPad varies by market but is one of Clash of Clans, Game of War: Fire Age, or Candy Crush Saga, except in Japan where it's Puzzles & Dragons. Doubledown Casino is high up there but it isn't the highest grossing game on the iPad. Clash of Clans and GoW:FA are making a multiplicative factor more than Doubledown Casino. I believe you about the slot machine mechanic though.
The problem isn't difficult without programming. It's the programming that's elegant because it's an interesting way to solve the program, by expressing their statements as functions and using the know and tell functions. It's actually really great how the logic was translated in code, almost like a direct translation from English to Python. Now that I know how to write the program, if the puzzle were to get rapidly more complex, say with 20 different statements of moderate complexity, I feel confident I could solve it with a program whereas I might struggle with pencil and paper.
I had this exact problem so I empathize with you. It was really painful, because my internet would go out sporadically for at least a minute every once in a while. My problem was also too much noise coming from a crowded apartment complex.
The solution I found was to upgrade to a 5 GHz router. The one I bought can transmit on both 2.4 GHz and 5 GHz, but I configured it to only transmit on 5 GHz. This forces my computer to always use the 5 GHz connection, which has less noise. The 5 GHz signal decays faster when it goes through walls, so the signal will not be as strong as a 2.4 GHz would, but the signal-to-noise ratio will be much better because 5 GHz is significantly less crowded.
It's because the article literally says it's 50.6 million uniques in the US: "Between desktop and mobile devices, MySpace reached 50.6 million unique users in the U.S. in November. That’s a massive surge of 575% versus the same month in 2013."
I read this as implying their uniques (as measured by, say, Google Analytics) were 50.6 million in the US, which probably means less than 50.6 million Americans visited the site in Nov. For instance, if every one of those uniques visited on both their smart phone and their computer, then it'd actually be 25 million real people. The truth is likely somewhere between 25 and 50 million Americans visited in Nov.
I hadn't thought about how devices can double count uniques. But this is still massive. I thought 50 million world wide was a lot when I saw the headline and got very surprised when I read it was referring to only the US