The Japanese supercomputer K, pictured in June 2012 at the RIKEN Advanced Institute for Computational Science in Kobe, western Japan. The K computer is currently ranked No. 3 on a list of the 500 fastest supercomputers. Kyodo/Landov hide caption

itoggle caption Kyodo/Landov

To selfie, or not to selfie? iStockphoto hide caption

itoggle caption iStockphoto

A security gap on Android, the most popular smartphone operating system, was discovered by security experts in a lab and is so far not widely exploited. iStockphoto hide caption

itoggle caption iStockphoto

Security experts' and non-experts' top security practices, according to Google's survey. Google Online Security Blog hide caption

itoggle caption Google Online Security Blog

Mark Cuban, left, as President of the United States, faces killer sharks with Ian Ziering in the Syfy film Sharknado 3: Oh Hell No! The Global Asylum/Syfy hide caption

itoggle caption The Global Asylum/Syfy

Kelly Hirano, vice president of engineering, demonstrates the Yahoo Sports Daily Fantasy contest during a product launch in July in San Francisco. Yahoo has designed this experience for the mobile fantasy player and offers Daily Fantasy, Full Season Fantasy, and real-time sports news and scores as an all-in-one experience. Eric Risberg/AP hide caption

itoggle caption Eric Risberg/AP

Chris Valasek (left) and Charlie Miller talk about hacking into vehicle computer systems during the Black Hat USA 2014 hacker conference in Las Vegas last August. Steve Marcus/Reuters/Landov hide caption

itoggle caption Steve Marcus/Reuters/Landov

The rise of ad blockers threatens the business model that drives much of the Internet economy. Danae Munoz/Ikon Images/Getty Images hide caption

itoggle caption Danae Munoz/Ikon Images/Getty Images