Datalog+/- is a family of ontology languages that combine good computational properties with high expressive power. Datalog+/- languages are provably able to capture the most relevant Semantic Web languages. In this paper we consider the class of weakly-sticky (WS) Datalog+/- programs, which allow for certain useful forms of joins in rule bodies as well as extending the well-known class of weakly-acyclic TGDs. So far, only non-deterministic algorithms were known for answering queries on WS Datalog+/- programs. We present novel deterministic query answering algorithms under WS Datalog+/-. In particular, we propose: (1) a bottom-up grounding algorithm based on a query-driven chase, and (2) a hybrid approach based on transforming a WS program into a so-called sticky one, for which query rewriting techniques are known. We discuss how our algorithms can be optimized and effectively applied for query answering in real-world scenarios.

If you're intent on keeping dementia at bay, new research suggests you'll need more than crossword puzzles, aerobic exercise and an active social life. In a study released Sunday, researchers found that older adults who did exercises to shore up the speed at which they processed visual information could cut by nearly half their likelihood of cognitive decline or dementia over a 10-year period. The new clinical trial results, presented Sunday at the Alzheimer's Assn.'s International Conference in Toronto, establish specialized brain training as a potentially powerful strategy to prevent Alzheimer's Disease and other afflictions, including normal aging, that sap memory and reduce function. With 76 million baby boomers reaching the age of maximum vulnerability to Alzheimer's and with no effective treatments available to alter the disease's progression, researchers are keen to find ways to prevent or delay the onset of the memory-robbing disease. The new research suggests that even years after it is administered, an inexpensive intervention without unwanted side effects might forestall dementia symptoms.

The most advanced automotive tech available ahead of the arrival of fully self-driving vehicles should, ideally, be incredibly sophisticated, and completely invisible to users. So far, of all the major tech companies, Amazon is the closest to striking that balance. Computers are complicated, and one thing drivers don't need in cars is complication. The safe operation of big, heavy, motor-powered vehicles that can travel as high speed relies heavily on an attentive driver paying attention to the control systems they use to make the car go, as well as to the world around them. Computers, whatever other advantages they have, require attention and focus to operate; figuring out how to make a computer do what you want, especially for any kind of advanced operationn, was always (and remains for many) a learning experience nearly on par with mastering a new language.

BEIJING--Wang Peixin has seen the future, and he's sure it features robots serving up fried dumplings. On a recent day, a white robot wearing a flowered kerchief rolled across Mr. Wang's Together Restaurant, a plate of pork-and-water-chestnut dumplings upon its built-in tray. As it traveled, it played an upbeat pop tune. A trio of customers hummed along and whipped out their phones to film its journey. "Young people like to pursue what's new, and robots are a fashionable, modern style of service," said Mr. Wang, who owns the Together Restaurant in central Beijing.

NASA's Mars rover Curiosity now has the ability to decide what targets it wants to capture with a camera or hit with its laser all on its own. The space agency announced this week that using artificial intelligence (A.I.) software, developed by NASA's Jet Propulsion Laboratory, the robotic rover is "frequently" choosing multiple targets per week all on its own. Most targets are still chosen by scientists curious about particular rocks or areas of soil they've seen in images that Curiosity has sent back to Earth, but the fact that the rover can make some of its own decisions about what to focus on adds a new, and important, capability to the mission. "This autonomy is particularly useful at times when getting the science team in the loop is difficult or impossible -- in the middle of a long drive, perhaps, or when the schedules of Earth, Mars and spacecraft activities lead to delays in sharing information between the planets," said NASA robotics engineer Tara Estlin, in a statement. Curiosity, which has been working on Mars since it landed in August 2012, has been searching for evidence that the Red Planet was ever capable of sustaining life – even in microbial form.

A few years ago, I started PredictionIO, an open source machine learning platform, with the mission to scale and simplify the development of machine learning technology. PredictionIO quickly grew in prominence and was even ranked on Github as the most popular Apache Spark-based machine learning product in the world. When Salesforce acquired PredictionIO in February, I was excited to have the amazing opportunity to continue to build our platform on a much larger scale. Today, I am thrilled to announce that Salesforce will donate the PredictionIO trademark to the Apache Software Foundation (ASF) and by unanimous vote the platform has been accepted into the ASF incubator program. This demonstrates the open source community's recognition of the importance of the PredictionIO project.

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The artificial intelligence market -- which includes computer vision, speech recognition, data analytics, and machine learning technologies -- is often considered the next frontier of computing. Research firm Markets and Markets estimates that the market will grow from 240 million in 2014 to 5.05 billion by 2020, fueled by rising demand for AI tech in the media, advertising, retail, finance, and healthcare sectors. In a previous article, I highlighted ten fascinating facts about the AI market. Today, I'll narrow the field down to three specific companies that could benefit from its growth -- IBM (NYSE:IBM), Nvidia (NASDAQ:NVDA), and Amazon (NASDAQ:AMZN). Many investors know IBM as a slow-growth tech company that posted 17 straight quarters of revenue declines.

Nasa has announced that it has found evidence of flowing water on Mars. Scientists have long speculated that Recurring Slope Lineae -- or dark patches -- on Mars were made up of briny water but the new findings prove that those patches are caused by liquid water, which it has established by finding hydrated salts. Several hundred camped outside the London store in Covent Garden. The 6s will have new features like a vastly improved camera and a pressure-sensitive "3D Touch" display

Law enforcement across the globe use semi-autonomous technology to do what humans find too dangerous, boring, or just can't. This week, the Cleveland Police had a few nonlethal ones on hand at the Republican National Convention. But even those can be outfitted to kill, as we saw in Dallas earlier this month when police strapped a bomb to an explosive-detonation robot, and boom: a non-lethal robot became a killer. If that thought scares you, you're not alone. Human rights activists worry these robots lack social awareness crucial to decision-making.