Vaccinations have been a contentious issue in recent years, particularly in North America, where parents have decided to forgo vaccinating their children due to potential health risks. According to health experts, this has led to an increase in potentially deadly diseases and an overall decrease in herd immunity. With so much fearmongering online about the potential deadly consequences of vaccinations, however, what information can we trust? This text provides primary source evidence from doctors and experts, along with scientific data, court cases, and the viewpoints of everyday people, in order to facilitate students’ own critical thinking about this important issue.