Researchers in some fields are more likely to share data in response to personal requests than by routinely submitting to public repositories, says a study (J. C. Wallis et al. PLoS ONE 8, e67332; 2013). The authors conducted 43 interviews with researchers who use wireless sensing, including biologists and seismologists; in more than two-thirds, participants did not report submitting to repositories, sometimes because a suitable one did not exist or because they wanted to know how data would be used. Co-author Jillian Wallis, an information-studies researcher at the University of California, Los Angeles, emphasizes that using repositories makes data easier to find and increases citations.