Particles of H5N1 virus — a particularly dangerous type of bird flu that can infect people — attack lung cells. Chris Bjornberg/Science Source hide caption

itoggle caption Chris Bjornberg/Science Source

Google is among several companies putting money into a fund to help safeguard the Internet from possible security flaws in open-source software. Marcio Jose Sanchez/AP hide caption

itoggle caption Marcio Jose Sanchez/AP

Hannah Rood, 3, receives an H1N1 vaccine at a clinic in San Pablo, California, during the 2009 swine flu epidemic. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

The Toyota Prius, seen here at the New York International Auto Show in March, was one of the cars security experts Chris Valasek and Charlie Miller showed to be susceptible to attacks by hackers. Mike Segar /Reuters /Landov hide caption

itoggle caption Mike Segar /Reuters /Landov

Big Data may not be much to look at, but it can be powerful stuff. For instance, this is what the new National Security Agency (NSA) data center in Bluffdale, Utah, looks like. George Frey/Getty Images hide caption

itoggle caption George Frey/Getty Images

Cell phone communication can be hacked, tapped or otherwise tampered with. A new app aims to change that. iStockphoto hide caption

itoggle caption iStockphoto