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Continuous Liquid Interface Production, or CLIP, uses liquid resin with ultraviolet light and oxygen projected through it to create more complex structures than those of existing 3-D printers. Nina Gregory/NPR hide caption

itoggle caption Nina Gregory/NPR

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

Emily Neblett, a patient at the Monroe Carell Jr. Children's Hospital in Nashville, Tenn., demonstrates circuit pieces from the mobile maker space that are connected by magnets. Noah Nelson/Youth Radio hide caption

itoggle caption Noah Nelson/Youth Radio

Barbara Beskind, 90, is a designer at IDEO who works with engineers on products that improve the quality of life for older people. Nicolas Zurcher/Courtesy of IDEO hide caption

itoggle caption Nicolas Zurcher/Courtesy of IDEO

Whirlpool's Kitchen of the Future is on display at the International Consumer Electronics Show in Las Vegas. The concept includes a cooktop and connected backsplash that offers recipes and other information. Whirlpool hide caption

itoggle caption Whirlpool

Developers Jelena Jovanovic (from left) and Christoph Kohstall and Intel Corp. CEO Brian Krzanich watch the Nixie wearable drone camera at the International Consumer Electronics Show in Las Vegas. Ethan Miller/Getty Images hide caption

itoggle caption Ethan Miller/Getty Images

Dealer Omar Abu-Eid adjusts a stack of chips before the first day of the World Series of Poker's main event in Las Vegas last July. Humans still reign in most versions of poker. Whew. John Locher/AP hide caption

itoggle caption John Locher/AP

Sony Pictures was forced to cancel the release of its film The Interview this week after the hacking group, Guardians of Peace, threatened theaters that planned to screen the movie. AFP/Getty Images hide caption

itoggle caption AFP/Getty Images

Interactive touch screens at the newly redesigned Cooper Hewitt museum let visitors sort through the catalog and create their own designs. Cooper Hewitt hide caption

itoggle caption Cooper Hewitt

German-American game developer Ralph Baer shows the prototype of the first games console which was invented by him during a press conference on the Games Convention Online in Leipzig, Germany in 2009. Baer died on Saturday. He was 92. Jens Wolf /DPA /Landov hide caption

itoggle caption Jens Wolf /DPA /Landov