When you are a postdoc and do a postdoc at the same time, it's called the two-body problem.
(Jokes aside, why is 50% of the summary devoted to this nitpicky grammatical distinction?)
What they mean is that it's not pay-to-win, unlike many other "free" games. Almost all purchasable items are purely cosmetic (skins, special effects, non-fighting pets that follow you) and have no gameplay effect, apart from one: extra stash tab to store items. These are nice to have, but not necessary to roll a successful character.
short of invading
There's the issue.
Re your other comment, Windows shortcuts are not better, they are standard.
And no, you're wrong, I have been using Emacs for a while and I still use it every now and then today. I have kept the habit of pressing Ctrl-X Ctrl-S to save rather than simply Ctrl-S when I am using another editor. Doesn't do me any good and is occasionally dangerous (when I happen to have highlighted text, or stuff in the clipboard I wish to preserve).
I would approve of requiring labeling on food if it was produced by one of these.
And yet it should be safer than regular food, if I understand correctly. There's less risk of virus infections and DNA transfer with humans (assuming it's a real risk in the first place...).
People like what they're used to, even if it's not necessarily the best thing.
That's why it takes an awful lot of work to convince someone to switch from Windows to Linux, especially when they are at a point in which regedit-hacking is "natural" and "easy" to them.
That's why neither Emacs nor Vi have adopted standard rest-of-the-world shortcuts such as ctrl+c, ctrl+v, after they've been around for, like, 30 years?
That's why you can't remove an option or change something in a software without disrupting someone's workflow (I'm too lazy to look up the relevant xkcd).
My answer is: forget about these old get-off-my-lawn users grumbling and go on, especially if what you are doing makes sense from a usability point of view. Focus on making things easy for new users instead.
(I guess I can kiss my karma goodbye - I have probably offended every possible category of Slashdot users here.)
I like some of the more subtle details in the title and summary: new math "techniques", "researchers need new mathematical tools", etc.
The summary isn't too inaccurate; what they are talking about is compressed sensing https://en.wikipedia.org/wiki/Compressed_sensing, i.e., the search for sparse (as in: with few nonzero elements) solutions to underdetermined systems of nonlinear equations. "Sparse" is understood in suitable basis, so for instance for a sound it could mean few different frequencies. The problem in itself is NP-hard, but it turns out that in some cases of interest you can get the solution or a reasonable approximation by solving a convex programming problem (minimizing the 1-norm rather than the sparsity).