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Facebook fights back against Russian trolls

Facebook's efforts to prevent people from using its platform to meddle in U.S. politics will rely in part on one very low-tech tool: postcards.

Later this year, the social network will begin sending postcards to verify the identities of people buying advertisements regarding candidates running for federal office. The move is part of Facebook's efforts to bring authenticity to election-related ads following criticism from the public and legislators over its handling of social media manipulation during the 2016 elections. Reuters first reported the postcard identification this week, and Facebook confirmed its plans to CNN Tech.

When people create certain political ads, Facebook will send a postcard via U.S. mail to a physical address. That postcard will include a code that the recipient will then enter online to verify their location.

It's similar to methods already in use by other digital companies, including the social network Nextdoor, which uses postcards as one way to confirm that users are in the neighborhoods they're discussing on the network, and Google, which uses them to verify local business listings.

For now, Facebook's postcard identification system will only apply to ads related to elections for federal offices, including the U.S. Senate and House of Representatives. Facebook has previously said that once ad buyers' identities are confirmed, all political ads on the site will contain a notice disclosing who paid for them. Facebook has previously said it hopes to launch its ad transparency efforts by this summer.

The postcard news comes in the wake of the indictment last week by Special Counsel Robert Mueller's office of 13 Russians and the Internet Research Agency, a Kremlin-linked troll group, for offenses related to their alleged interference in the U.S. political system and the 2016 presidential election. Much of the activity described in the indictment took place on Facebook ( ) .

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, Technology engineering

By Sarah Yang , Media relations |

When UC Berkeley engineers say they are going to make you sweat, it is all in the name of science.

UC Berkeley engineers put their wearable sweat sensors to the test. (UC Berkeley video produced by Roxanne Makasdjian and Stephen McNally, UC Berkeley)

Specifically, it is for a flexible sensor system that can measure metabolites and electrolytes in sweat, calibrate the data based upon skin temperature and sync the results in real time to a smartphone.

Users wearing the flexible sensor array can run and move freely while the chemicals in their sweat are measured and analyzed. The resulting data, which is transmitted wirelessly to a mobile device, can be used to help assess and monitor a user’s state of health. (Image by Der-Hsien Lien and Hiroki Ota, UC Berkeley)

While health monitors have exploded onto the consumer electronics scene over the past decade, researchers say this device, reported in the Jan. 28 issue of the journal Nature , is the first fully integrated electronic system that can provide continuous, non-invasive monitoring of multiple biochemicals in sweat.

The advance opens doors to wearable devices that alert users to health problems such as fatigue, dehydration and dangerously high body temperatures.

“Human sweat contains physiologically rich information, thus making it an attractive body fluid for non-invasive wearable sensors,” said study principal investigator Ali Javey, a UC Berkeley professor of electrical engineering and computer sciences. “However, sweat is complex and it is necessary to measure multiple targets to extract meaningful information about your state of health. In this regard, we have developed a fully integrated system that simultaneously and selectively measures multiple sweat analytes, and wirelessly transmits the processed data to a smartphone. Our work presents a technology platform for sweat-based health monitors.”

Javey worked with study co-lead authors Wei Gao and Sam Emaminejad, both of whom are postdoctoral fellows in his lab. Emaminejad also has a joint appointment at the Stanford School of Medicine, and all three have affiliations with the Berkeley Sensor and Actuator Center and the Materials Sciences Division at Lawrence Berkeley National Laboratory.

Chemical clues to a person’s physical condition

To help design the sweat sensor system, Javey and his team consulted exercise physiologist George Brooks, a UC Berkeley professor of integrative biology. Brooks said he was impressed when Javey and his team first approached him about the sensor.

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