Alexander Kendrick stands in the Lake of the Clouds after testing his invention. He and the team of cavers executed the deepest known digital communication ever to take place in the United States. Brad Horn for NPR hide caption

itoggle caption Brad Horn for NPR

Studies show that only about 40 percent of health care workers in the U.S. wash their hands as often as they should. Rob Carr/AP hide caption

itoggle caption Rob Carr/AP

According to a study of four jurisdictions that have banned the use of hand-held devices while driving, the laws have not reduced accident rates. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Wi-Fi-enabled versions of the iPad will be available in March. Five of the six major American publishing companies have agreed to deals that will provide Apple's new iBooks store with content. Courtesy of Apple hide caption

itoggle caption Courtesy of Apple

The iPad contains no major new technology, which meant it got a big ho-hum from some analysts. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images