An aerial view of Monticello shows Mulberry Row to the right of Thomas Jefferson's house. Robert Llewellyn/© Thomas Jefferson Foundation at Monticello hide caption

itoggle caption Robert Llewellyn/© Thomas Jefferson Foundation at Monticello

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