As a measles outbreak sweeps through parts of the United States, vaccines have become the subject of considerable debate. Over a dozen states have proposed legislation to toughen vaccine laws. Major newspapers have carried editorials railing for or against mandatory vaccination. Angry people have weighed in on both sides. So what's the big deal? In this class we will talk about what vaccines are, how they work, and why some people are so angry about them. So roll up your sleeves, leave your fear of needles behind, and prepare to dig into the exciting and fascinating world of vaccinations!