Related by context. Frequent words. (Click for all words.) 86 Scientists 79 researchers 68 Biologists 66 Previous studies 65 Physicists 63 Experts 60 scientists 59 Officials [002] 57 Astronomers 57 Archaeologists 56 Investigators 56 Psychologists 54 Authorities 53 Geologists 49 study 48 Doctors 48 Organizers 48 Clinical trials 47 Economists 46 Studies 46 Historians 46 Proponents 46 Policymakers 46 Regulators 45 researcher 45 Experiments 45 Veterinarians 45 Detectives 44 Clinicians 44 Researcher 44 Activists 44 Conservationists 44 physicists 44 Some 44 Participants 43 Observers 43 Rescuers 43 biologists 42 Research 42 Prosecutors 42 Skeptics 42 Surveys 42 Others 42 Analysts 42 Meteorologists 42 Lawmakers 42 Many 42 Dozens 41 Hundreds 41 brain scans 41 University 41 Searchers 41 Environmentalists 40 Administrators 40 Campaigners 40 Epidemiology 40 Emergency crews 40 neuroscientist 40 studies 40 Organisers 40 Students 40 journal Science 40 Inspectors 40 They 40 Pregnant women 39 epidemiologists 39 Medicine 39 Study 39 Opponents 39 Backers 39 Imperial College 39 Critics 39 psychology professor 39 sociologists 38 Residents 38 Lead researcher 38 experts 38 journal Nature 38 Several 38 Laboratory 38 Surgeons 38 Newswise 38 Findings 38 Advocates 38 Respondents 38 Genetic 38 Negotiators 37 Academics 37 archaeologists 37 Thousands 37 Planners 37 Psychiatrists 37 Staffers 37 Demonstrators 37 Executives 37 ecologists 37 geneticist 37 computer simulations 37 Forecasters 37 Relatives 37 Firefighters