The document discusses the history and future of vaccines. It begins by explaining how vaccines work by tricking the immune system to produce antibodies to fight a harmless form of the virus. Next, it discusses how while hypodermic injection is most common, scientists are searching for alternative delivery methods. The document then discusses how Edward Jenner conducted the first vaccination against smallpox in the late 1700s and how Louis Pasteur developed the first vaccine against rabies in 1885. Finally, it notes that as more vaccines were developed, large groups like soldiers began being vaccinated against diseases during World Wars I and II.