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(credit: Christian Petersen / Gett Images)

It’s not often that you can say you’re in better shape than an Olympic athlete. But an American adult is half as likely as an Olympian to have cavities, based on data from the CDC and from a 2013 study of athletes competing in the 2012 London Olympics. And three-quarters of these Olympians had gingivitis.

Of course, the demands of Olympic-level training set these athletes apart from the rest of us. Thirty percent of the athletes studied had taken a blow to the mouth, jaw, or face. And the average person doesn’t need an Olympic marathoner’s high-carb diet or sports drinks, which can contribute to tooth decay and other problems.

Professor Ian Needleman, who co-authored the 2013 study, explained in an interview with Ars the additional risk factors that Olympic athletes face. Needleman, of the Centre for Oral Health and Performance at the UCL Eastman Dental Institute in London, noted that “there’s good evidence that during high-intensity training, immunity is challenged.” Prolonged training also leads to dehydration in the mouth, he said, “and we have very good data showing that dehydration reduces saliva’s protection” against tooth decay, dental erosion, and gum disease.

(credit: Kim et al., Science (2016))

Touchscreens have transformed the way we interact with electronics, enabling the development of elegant handheld devices. But currently, their screens are limited to a fixed size. As flexible and wearable electronics are in development, the touchscreens we'll need in the future will have to be both flexible and biocompatible. In an investigation recently published in Science, researchers have designed an ionic touchscreen that boasts stretchability and biocompatibility, allowing easy integration with the human body.

The team selected a hydrogel-based material for their work. Hydrogels are soft, water-filled polymer networks; their mechanical properties are similar to those of certain tissues, and they can be made of biocompatible materials. As an added bonus, they’re highly transparent. In this case, the scientists selected an ionic hydrogel—a polyacrylamide base containing lithium chloride salts.

For a gel to function as a touchscreen panel, it has to conduct electricity, which is why there's lithium chloride present. To produce a uniform electrostatic field across the panel, voltage was applied at all the panel corners. When a person touches the panel with their finger, the finger acts as a conductor that is grounded. As a result, a potential difference is generated between the electrode and the touch point causing the current to flow from the electrode through the finger.

When Metal Gear Solid series auteur Hideo Kojima left Konami under extremely strained circumstances last year, many worried about what the corporate parent would do with the storied Metal Gear franchise IP it still controlled. Well worry no longer: the newly announced Metal Gear Survive stays true to the series' long-established roots of stealth action, amazing visuals, and multiplayer, interdimensional battles against zombie hordes.

Wait, what was that last part?

Yes, despite the Metal Gear branding, Survive looks like it couldn't be much more different from the well-known Metal Gear Solid games. Set just after the events of Metal Gear Solid 5: Ground Zeroes, the online multiplayer game will let four characters from that game's Mother Base fight together to survive against "living biological threats" in "a distorted desert landscape" that's part of "an alternate timeline caused by unexplained wormholes forming in the sky," according to a press release.

(credit: Kham Tran)

Verizon Wireless is reportedly trying to add more bloatware to Android phones by installing apps from other companies in exchange for payment. "The wireless carrier has offered to install big brands' apps on its subscribers' home screens, potentially delivering millions of downloads, according to agency executives who have considered making such deals for their clients," Advertising Age reported yesterday. "But that reach would come at a cost: Verizon was seeking between $1 and $2 for each device affected, executives said."

Bloatware has been a problem on Android phones for years, and this wouldn't be the first time Verizon Wireless was the culprit. But the company's latest moves sound like they have the potential to make things worse.

Verizon started pitching the app installs to retail and finance companies, among others, late last year, according to Advertising Age. Verizon only makes the offer for Android phones since carriers don't have the same access to Apple's iPhone.

Google’s appeal against an antitrust ruling over its Android operating system in Russia was tossed out by Moscow’s ninth arbitration court on Wednesday.

The ad giant was fined 438 million rubles (£5.25 million, $6.85 million) by the country’s competition watchdog, the Federation Antimonopoly Service (FAS) last week. FAS found that Google had imposed restrictive contracts on mobile phone manufacturers who want to use its Android operating system, forcing them to pre-install other Google services, while blocking those of rivals.

As well as the fine, FAS ordered Google to mend its ways and floated the possibility of an out of court settlement. However, the two sides failed to strike such a deal, FAS said on Tuesday. Today, the court rejected Google’s appeal against binding obligations to resolve the case.