News in Brief Terrorist Attacks on Railroads Would Be Difficult Past experiences suggest that terrorists who want to derail a train are facing a much more complex task than just leaving a penny on the rail. See More
News in Brief Why Americans Will Never Give Up Their Guns New research finds the strongest motivation to buy handguns is the vague but deeply held perception that we live in a dangerous world. See More
News in Brief Facebook Is Planning on Turning Its Data Over to Social Scientists. Should Users Trust the Project? We spoke with social-science ethicists about how well Facebook's initiative appears to protect users' privacy. They're skeptical, but still eager to see Facebook data studied. See More