New submitter JackDW writes: Tetris is one of the best-known computer games ever made. It's easy to play but hard to master, and it's based on a NP-hard problem. But that's not all that's difficult about it. Though it's simple enough to be implemented in one line of BBC BASIC, it's complex enough to be really hard to thoroughly test.

It may seem like you can test everything in Tetris just by playing it for a few minutes, but this is very unlikely! As I explain in this article, the game is filled with special cases that rarely occur in normal play, and these can only be easily found with the help of a coverage tool.

jimwormold writes: I need to build a system for outdoor use, capable of withstanding a high pressure water jet! "Embedded PC," I hear you cry. Well, ideally yes. However, the system does a fair bit of number crunching on a GPU (GTX970) and there don't appear to be any such embedded systems available. The perfect solution will be as small as possible (ideally about 1.5x the size of a motherboard, and the height will be limited to accommodate the graphics card). I'm U.K.- based, so the ambient temperature will range from -5C to 30C, so I presume some sort of active temperature control would be useful.

I found this helpful discussion, but it's 14 years old. Thus, I thought I'd post my question here. Do any of you enlightened Slashdotters have insights to this problem, or know of any products that will help me achieve my goals?

An anonymous reader writes: Cristophe de Dinechin, long-time software developer, has an interesting article on the processes involved in building the major browsers. From the article:

"Mozilla Firefox, Chromium (the open-source variant of Chrome) and WebKit (the basis for Safari) are all great examples of open-source software. The Qt project has a simple webkit-based web browser in their examples. So that's at least four different open-source web browsers to choose from. But what does it take to actually build them? The TL;DR answer is that these are complex pieces of software, each of them with rather idiosyncratic build systems, and that you should consider 100GB of disk space to build all the browsers, a few hours of download, and be prepared to learn lots of new, rather specific tools."

An anonymous reader writes: Oculus, creator of the Rift VR headset, has released a new version of their SDK which brings with it long sought-after support for Linux, which the company says is "experimental." Linux support was previously unavailable since the launch of the company's second development kit, the DK2. The latest SDK update also adds support for Unity Free, the non-commercial version of the popular game authoring engine. Previously, Unity developers needed the Pro version—costing $1,500 or $75/month—to create experiences for the Oculus Rift.

An anonymous reader writes: In a post at the Free Software Foundation, lawyer Marco Ciurcina reports that the Italian Supreme Court has ruled the practice of forcing users to pay for a Windows license when they buy a new PC is illegal. Manufacturers in Italy are now legally obligated to refund that money if a buyer wants to put GNU/Linux or another free OS on the computer. Ciurcina says, "The focus of the Court's reasoning is that the sale of a PC with software preinstalled is not like the sale of a car with its components (the 4 wheels, the engine, etc.) that therefore are sold jointly. Buying a computer with preinstalled software, the user is required to conclude two different contracts: the first, when he buys the computer; the second, when he turns on the computer for the first time and he is required to accept or not the license terms of the preinstalled software. Therefore, if the user does not accept the software license, he has the right to keep the computer and install free software without having to pay the 'Microsoft tax.'"

A reader writes with news that medical researchers from Harvard Medical School and Massachusetts General Hospital have successfully cultivated stem cells that will kill brain cancer cells in mice without damaging healthy cells. "They used genetic engineering to make stem cells that spewed out cancer-killing toxins, but, crucially, were also able to resist the effects of the poison they were producing. ... In animal tests, the stem cells were surrounded in gel and placed at the site of the brain tumor after it had been removed. Their cancer cells then died as they had no defense against the toxins (abstract)." The next step in the research is to try the treatment on humans. Chris Mason, a professor of regenerative medicine, said, "This is a clever study, which signals the beginning of the next wave of therapies. It shows you can attack solid tumors by putting mini pharmacies inside the patient which deliver the toxic payload direct to the tumor. Cells can do so much. This is the way the future is going to be."

sabri writes: Following the initial suspension of a California Highway Patrol officer earlier this week, news has come out that the CHP has an entire ring of officers who steal and subsequently share nude pictures. The nudes are stolen from women who are arrested or stopped. Officer Sean Harrington of Martinez reportedly confessed to stealing explicit photos from the suspect's phone, and said he forwarded those images to at least two other CHP officers. Where is the ACLU when you need them the most?

theodp writes According to Steve Ballmer, Amazon.com is not a real business. "They make no money," Ballmer said on the Charlie Rose Show. "In my world, you're not a real business until you make some money. I have a hard time with businesses that don't make money at some point." Ballmer's comments come as Amazon posted a $437 million loss for the third quarter, disappointing Wall Street. "If you are worth $150 billion," Ballmer added, "eventually somebody thinks you're going to make $15 billion pre-tax. They make about zero, and there's a big gap between zero and 15." Fired-up as ever, LA Clippers owner Ballmer's diss comes after fellow NBA owner Mark Cuban similarly slammed IBM, saying Big Blue is no longer a tech company (Robert X. Cringely seems to concur). "Today, they [IBM] specialize in financial engineering," Cuban told CNBC after IBM posted another disappointing quarter. "They're no longer a tech company, they are an amalgamation of different companies that they are trying to arb[itrage] on Wall Street, and I'm not a fan of that at all."

An anonymous reader writes Google has expanded its search engine with the capability to recognize video games. If your query references a game, a new Knowledge Graph panel on the right-hand side of Google's search results page will offer more information, including the series it belongs to, initial release date, supported platforms, developers, publishers, designers, and even review scores. Google spokesperson: "With today's update, you can ask questions about video games, and (while there will be ones we don't cover) you'll get answers for console and PC games as well as the most popular mobile apps."

Lasrick links to this interview with Peter Kuran, an animator of the original Star Wars and legendary visual effects artist, writing If you saw the recent remake of Godzilla, you saw stock footage from Atom Central, known on YouTube as 'the atomic bomb channel.' Atom Central is the brainchild of Kuran, who among his many talents is an expert on archival films of the atmospheric testing era of 1945 to 1963. Combining his film restoration and photography expertise with his interest in nuclear history, he has also produced and directed five documentaries. He is currently working with Lawrence Livermore and Los Alamos National Laboratories to preserve and catalog images from the bomb-testing era, and to produce a technical handbook that will help people understand these images and the techniques used to create them.

operator_error notes a report that ownCloud developer Lukas Reschke has emailed the Ubuntu Devel mailing list to request that ownCloud (server) be removed from the Ubuntu repositories because it contains "multiple critical security bugs for which no fixes have been backported," through which an attacker could "gain complete control [of] the web server process." From the article: However, packages can't be removed from the Ubuntu repositories for an Ubuntu version that was already released, that's why the package was removed from Ubuntu 14.10 (2 days before its release) but it's still available in the Ubuntu 14.04 and 12.04 repositories (ownCloud 6.0.1 for Ubuntu 14.04 and ownCloud 5.0.4 for Ubuntu 12.04, while the latest ownCloud version is 7.0.2). Furthermore, the ownCloud package is in the universe repository and software in this repository "WILL NOT receive any review or updates from the Ubuntu security team" (you should see this if you take a look at your /etc/apt/sources.list file) so it's up to someone from the Ubuntu community to step up and fix it. "If nobody does that, then it unfortunately stays the way it is", says Marc Deslauriers, Security Tech Lead at Canonical. You can follow the discussion @ Ubuntu Devel mailing list. So, until (if) someone fixes this, if you're using ownCloud from the Ubuntu repositories, you should either remove it or upgrade to the latest ownCloud from its official repository, hosted by the openSUSE Build Service."

SmartAboutThings writes Microsoft has recently published its Q1 fiscal 2015 earnings report, disclosing that it has made $4.5 billion in net income on $23.20 billion in revenue. According to the report, revenue has increased by $4.67 billion, compared to $18.53 billion from the same period last year. However, net income has decreased 14 percent compared to last year's $5.24 billion mainly because of the $1.14 billion cost associated with the integration and restructuring expenses related to the Nokia acquisition.

But what's finally good news for the company is that the Surface gross margin was positive this quarter, which means the company finally starts making money on Surface sales. Microsoft didn't yet reveal Surface sales, but we know that Surface revenue was $908 million this quarter, up a massive 127 percent from the $400 million this time last year. However, if we assume that the average spent amount on the purchase of this year's Surface Pro 3 was around $1000, then we have less than 1 million units sold, which isn't that impressive, but it's a good start.