Humans fight viruses with knowledge which was especially important during the Covid-19 epidemic. Detailed graphics and engaging video help viewers learn about virus attacks - microscopic viruses, virus reproduction, parts of a virus (nucleic acid, capsid, and viral envelope/lipids), a virus in a host cell, and host organisms; fighting viruses - immune systems, fevers, white blood cells, flushing out viruses, transmitting viruses, antibodies, mutations, healing sleep, and vaccines; societal changes and disease - pandemics, epidemics, epidemiologists, and immunologists; Covid-19 and what you can do to stay safe.