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If you've been sitting, wishing and waiting for your Android handset to let you make free data-based calls, then today's your lucky day. Our chums over at Engadget Spanish have discovered that WhatsApp's long-promised voice calling is now available to everyone. Once updated, the app provides a new tab that'll let you dial friends on top of texting them. So how does it work? I gave it a whirl over here in France, calling my colleague Richard Lai in Hong Kong. The quality was pretty clear, though there was a delay of at least a few seconds -- though that's typical of any VOIP service (hello, Skype) and a redial might've cleared it up. Also, we are 6,000 miles apart.

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US air warfare superiority is hardly a given anymore -- sometimes the nation's very pricey new fighter jets aren't even airworthy, let alone dominant. Even the military's science arm, DARPA, said that "US military systems today are often too expensive... (and) are obsolete by the time they become operational." Ouch. But DARPA is at least doing something about the problem. It's developed a project called the System of Systems Integration Technology and Experimentation (SoSITE) with the aim of nothing less than completely overhauling US military air power. To do that, it wants to build open systems that help drones, missiles, "mission truck" planes and fighter jets work together.

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Square Enix, the gamesmaker that gave us the Final Fantasy series (alongside plenty of other games), also has a sideline in fancy high-end action figures. Its latest collection tackles the Star Wars universe, well, the darker side of said universe. Alongside Darth Vader (which was teased late last year), Play Arts Kai (the brand Square Enix releases them under) has revealed two more additions: a particularly stoic-looking Stormtrooper and Boba Fett. But reimagining action figures (or perhaps licensing) ain't cheap: Each one retails for around 12,000 yen (roughly $100), but (but!) they can be articulated at 14 different points, with three joints on each arm for maximum dramatic posturing... not to mention reminding yourself (and younger family members) that these aren't for kids.

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There's a growing number of smart locks out there, but if design's as important to you as feature set, this one could be of interest. The device is called Friday Smart Lock, and it can be unlocked remotely through its accompanying iOS or Android app. Once installed, and with the app set up, you can grant both one-time or permanent (revokable) access to friends and family. Its creators, tech startup Friday Labs and architectural firm Bjarke Ingels Group, made the device small, so the baseplate and battery fits inside existing US single cylinder and Scandinavian deadbolts.

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Fear of public speaking is quite common, and chances are you either know someone who has it or you suffer from the phobia yourself. This smart glass app called Rhema, created by researchers from the Human-Computer Interaction Group at the University of Rochester, was designed for people who need a bit of help addressing crowds. Rhema can listen as you speak, upload your recorded voice to a server, analyze its pace and volume, and then give you feedback in real time. To test it out, the team had 30 subjects try out several different feedback systems installed on Google Glass. These include ones that shows a traffic lights-like scheme and another that uses graphs.

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The ARC pen pictured above might look laughably large, but it could be the perfect option for folks with Parkinson's disease. It was created by a group of students from UK's Royal College of Art and the Imperial College London to combat a Parkinson's symptom called micrographia. That's characterized by a patient's handwriting becoming smaller and more cramped as they go along, to the point that it's not readable anymore. This pen prevents that from happening by stimulating key muscles through vibration (it's equipped with motors to make that happen), giving users more control over their hands. Further, its large size makes it more comfortable to hold than regular pens.

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What do you get when you mix leeks, garlic, wine and bull gall, then ferment it in a copper pot for nine days? In the Anglo-Saxon era, this concoction made a terrific treatment for eye styes but recently researchers have found it equally effective against the scourge of modern medicine: antibiotic-resistant MRSA "superbugs." Freya Harrison, a microbiologist at the University of Nottingham, UK working with Dr Christina Lee, an Anglo-Saxon expert from the School of English, found the ancient recipe in Bald's Leechbook, an Old English medical compendium. The two decided to test its against modern skin infections. Using the oldest heirloom vegetable varieties she could find, Harrison brewed up the recipe, then let it stand the requisite time. What she poured out displayed some incredible antibiotic characteristics.

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LG is scheduled to drop something big on April 28th. And if the "G's" in the save the date invites (above) it sent out to the press is any indication, we can most likely expect its next G-series flagship phone. Besides, several Korean publications already revealed that LG will launch the G4 by the end of April. Some of those publications also claimed that the phone will have a 5-inch curved Quad HD display, but there's probably no use speculating if that's true or not when we're this near to seeing the real thing. The South Korean company will hold an event in New York and other locations around the globe (New York, London, Seoul, Singapore and Istanbul), and we'll be there to cover it, so stay tuned!

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Toyota Safety System

You won't have to splurge on a luxury car (or a pricey option package) just to get a vehicle that will brake by itself in a crisis. Toyota has launched a strategy that will bring automatic braking to most of its lineup, not just premium rides. The technology will be a relatively low-cost ($300 to $635) option for just two vehicles at first, the RAV4 Hybrid SUV and Lexus' RX crossover, but the automaker hopes to have it available or included in "nearly all" of its models by the end of 2017. It'll be easy to find in the near future, too. The Avalon sedan is next in line, and a total of seven additional Toyota and Lexus models are on deck this year. Toyota certainly isn't the only company hoping to popularize smart braking, but this plan could be one of the most ambitious.

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Dyson really hates dirt, to the point that it's now come up with a new bladeless fan that can also filter out ultrafine airborne particles -- including viruses, bacteria and pollens -- that are as tiny as 0.1 microns. The aptly-named Pure Cool (AM11) closely resembles Dyson's other fan towers, with the notable difference being the cylindrical glass HEPA filter around the base. After 450 prototypes, the company claims that this filter removes 99.95 percent of ultrafine particles, and it's good for up to 4,382 hours or about six months of continuous use. In other words, if you use the Pure Cool for 12 hours each day, then you'll only need to replace the filter after a year. Of course, it's hard to say whether it'll last just as long in smoggy Beijing, which is where Dyson cleverly chose to do the global launch for the Pure Cool.

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