Nathah Wolfe is a scientist who studies viruses. A virus is very small. it lives inside other creatures-like bacteria, plants, animals, and people. Some viruses are deadly, and can kill. Many diseases caused by viruses are difficult to cure, but we can prevent them from getting into our bodies. ln today's globalized, world,scientists in different countries can work together more easily to help sick people, but viruses can also spread more quickly than ever.