evidence: For years scientists have said that there is no link between vaccines and autism. There are still many people who are reluctant to vaccinate. But, one woman has changed her mind about vaccines. Scientists have said over and over for years that there is no link between vaccines and autism. But there are still a lot of people who are reluctant to vaccinate themselves and their children because they believe there's a risk, which leads to a question - why is it so hard to refute misinformation? NPR's Shankar Vedantam has the story. [...] VEDANTAM: She became immersed in new groups online, and she began to Google again. But this time, she realized that science had not shown a link between vaccines and autism. She got her daughter vaccinated and has never looked back.