A drone takes its first flight at Edwards Air Force Base in California in February. In the near future, drones could be used outside of the military for things like traffic helicopters or flying jumbo jets. Alan Radecki/AP hide caption

itoggle caption Alan Radecki/AP

Sean Mullin, CEO of BI2 Technologies, scans his own eye with the MORIS, or Mobile Offender Recognition and Information System. The device attaches to an iPhone and allows police in the field to scan a person's iris, face or fingerprint and then check it against a database to verify his or her identity. Tovia Smith/NPR hide caption

itoggle caption Tovia Smith/NPR

Chinese moviegoers wear 3-D glasses as they watch Avatar in January 2010. AFP/Getty Images hide caption

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Security expert Markus Jakobsson says the best password could be as simple as combining words from a story that only you know. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A wrecked train carriage is lifted from the scene of a crash Saturday involving two trains in Wenzhou, in China's Zhejiang province. ChinaFotoPress/Getty Images hide caption

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GOP presidential hopefuls use 140 characters or less to answer the question: "As president, how will you avoid continually raising the debt ceiling?" Amy Ta/NPR hide caption

itoggle caption Amy Ta/NPR