Vaccines eradicated smallpox. They have prevented billions of cases of diseases and deaths globally. How are vaccines created? What do they do to boost your immune system and protect you from disease? What vaccinations do you need? Who should be vaccinated and at what age? We'll explore the history of vaccine development and take a look at the current SARS-CoV-2 vaccines. Finally, we'll examine some disastrous results of anti-vaccination campaigns.