Despite mounting scientific evidence to the contrary, thousands of families still ardently believe that vaccines containing the mercury-based preservative thimerosal are the cause of their children’s autism. A study published Wednesday in The New England Journal of Medicine concluding that there is no correlation between thimerosal and neuropsychological development in young children is unlikely to dissuade them. And two articles accompanying the new study, including one that sounds the alarm about a coming onslaught of civil lawsuits against vaccinemakers by autism families, will hardly defuse the emotionally charged issue. Together, the three journal pieces highlight the the tangle of scientific, medical and legal strands underlying one of our most enduring and complicated public-health controversies.