Explore the fascinating world of viruses and human health in this comprehensive TED-Ed video series. Delve into topics such as the eradication of smallpox, the cellular battle against viruses, and the impact of stress on the body. Learn about the effectiveness of soap versus hand sanitizer, the workings of the immune system, and the science behind feeling ill. Discover how vaccines and ventilators function, understand the nature of coronaviruses, and explore the process of zoonotic disease transmission. Investigate the rapid development of vaccines, the protective properties of mucus, and the reasons behind annual flu shots. Gain insights into bat immunity, germ spread, and the evolution of disease understanding. Examine methods for identifying viral infections and learn valuable lessons from the successful eradication of smallpox.