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More than 600 Porto city buses and taxis have been fitted with routers to provide free Wi-Fi service. It's being touted as the biggest Wi-Fi-in-motion network in the world. Sérgio Rodrigues/Veniam hide caption

itoggle caption Sérgio Rodrigues/Veniam

The sun sets as a visitor uses his mobile phone Monday during the opening day of the 2015 Mobile World Congress in Barcelona. Wall Street Journal reporter Ryan Knutson — interviewed from the conference Monday via Skype by NPR's Robert Siegel — says that for some smartphone users, Wi-Fi may be able to replace most of the functionality of a cellphone carrier. Josep Lago/AFP/Getty Images hide caption

itoggle caption Josep Lago/AFP/Getty Images

Tinder is launching Tinder Plus, a new version of its app with added features including the ability to have another look at a potential match you swiped away. Tinder hide caption

itoggle caption Tinder

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A man takes a "selfie" while waiting in line to cast his vote in the Wisconsin gubernatorial race in November. Darren Hauck/Getty Images hide caption

itoggle caption Darren Hauck/Getty Images

Operators at a Bell System telephone switchboard, as photographed by the Department of Labor Women's Bureau. U.S. National Archives hide caption

itoggle caption U.S. National Archives

T-Mobile CEO John Legere pitches a plan that allows unlimited music streaming without additional data charges. Some net neutrality proponents want the FCC to limit plans like these; the commission says it will review them on a case-by-case basis. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

With the technology to conduct more nuanced tests, some companies say they can provide more useful detail about how people think in dynamic situations. Marcus Butt/Getty Images/Ikon Images hide caption

itoggle caption Marcus Butt/Getty Images/Ikon Images

President Obama, joined by Homeland Security Secretary Jeh Johnson (left), delivers remarks at the National Cybersecurity and Communications Integration Center on Jan. 13 in Arlington, Va. Obama discussed efforts to improve the government's ability to collaborate with industry to combat cyber threats. Kristoffer Tripplaar-Pool/Getty Images hide caption

itoggle caption Kristoffer Tripplaar-Pool/Getty Images

A staff member from DJI Technology Co. demonstrates a drone in Shenzhen, in southern China's Guangdong province. A new website lets people request that drones stay away from their property. Kin Cheung/AP hide caption

itoggle caption Kin Cheung/AP

"Jennifer In Paradise," a photo of Jennifer Walters in Bora Bora in August 1988, was the first color image to ever be Photoshopped. John Knoll used the image of his then-girlfriend (now wife) to demo Photoshop to potential users. John Knoll hide caption

itoggle caption John Knoll

Dmitri Alperovitch, co-founder of the cybersecurity startup CrowdStrike, says his company is building stockpiles of intelligence about potential hacking groups. Keith Bedford/Reuters/Landov hide caption

itoggle caption Keith Bedford/Reuters/Landov

Jimmy Underhill, drone technician for Agribotix, holds a drone at a farm in rural Weld County, Colorado. Luke Runyon/KUNC hide caption

itoggle caption Luke Runyon/KUNC

In a project called "Natural Frequencies," the bells in the Campanile on the University of California, Berkeley campus were recently programmed to play a score composed in real time by the seismic shifts taking place along the Hayward fault. Eric Risberg/AP hide caption

itoggle caption Eric Risberg/AP

Michael Calce, who went by the online name Mafiaboy when he launched a massive cyberattack at the age of 15, now works as a security consultant for companies trying to protect their online systems. Vincenzo D'Alto/Courtesy of Michael Calce hide caption

itoggle caption Vincenzo D'Alto/Courtesy of Michael Calce

Anthem says 80 million company records were accessed in what may be one of the largest health care data breaches to date. Aaron P. Bernstein/Getty Images hide caption

itoggle caption Aaron P. Bernstein/Getty Images

Cameo Stevens, 35, plays Mike Tyson's Punch-Out! at Save Point Video Games in Charlotte, N.C. The market for old video games of the '80s and '90s has seen a surge in recent years. Ben Bradford/WFAE hide caption

itoggle caption Ben Bradford/WFAE