The CRISPR enzyme (green and red) binds to a stretch of double-stranded DNA (purple and red), preparing to snip out the faulty part. Illustration courtesy of Jennifer Doudna/UC Berkeley hide caption

itoggle caption Illustration courtesy of Jennifer Doudna/UC Berkeley

One of 30 copies of the first protoype meter made by the International Bureau of Weights and Measures (BIPM) in Sevres, France. 1875-1889 NIST Museum Collection hide caption

itoggle caption NIST Museum Collection

Manic, sad, up, down. Your voice may reveal mood shifts. iStockphoto hide caption

itoggle caption iStockphoto

Noah Shaw, now 5, shows off his Texas roots at a recent birthday party. Courtesy of Bryan Shaw hide caption

itoggle caption Courtesy of Bryan Shaw

The Z machine is located in Albuquerque, N.M., and is part of the Pulsed Power Program, which started at Sandia National Randy Montoya/Sandia National Laboratory hide caption

itoggle caption Randy Montoya/Sandia National Laboratory

Current water-filtering technology is costly, but MIT scientists are testing a simpler and cheaper method that uses wood from white pine trees. Wikimedia Commons hide caption

itoggle caption Wikimedia Commons

About 50,000 years ago, a meteorite struck earth east of present-day Flagstaff, leaving this crater as its calling card. Shane.torgerson/Wikimedia Commons hide caption

itoggle caption Shane.torgerson/Wikimedia Commons

A nurse attaches the low-cost breathing machine (far left) to an infant at The Queen Elizabeth Central Hospital in Blantyre, Malawi. Jocelyn Brown/Rice University hide caption

itoggle caption Jocelyn Brown/Rice University