Ray Dos Santos, a mathematician and computer scientist with the U.S. Army Engineer Research and Development Center’s Geospatial Research Laboratory, Alexandria, Virginia, uses large amounts of historical data, social media activity and news articles to identify the best indicators of when and where a terrorist attack may take place. This “Big Data” approach uses massive amounts of available information, along with high-end parallel computing, to find important clues in the fight against rogue activities. (U.S. Army Corps of Engineers photo)