Francis Csedrik remembers details of being bonked hard on the head when he was 4, and having to go to the emergency room. Meg Vogel/NPR hide caption

itoggle caption Meg Vogel/NPR

The National Security Agency says its massive new data center near Salt Lake City will enhance the agency's ability to analyze the email, text message, cellphone and landline metadata it collects. Rick Bowmer/AP hide caption

itoggle caption Rick Bowmer/AP

Researchers are using MRI scans to learn more about the brains of people with extraordinary memory. iStockphoto.com hide caption

itoggle caption iStockphoto.com