Home > Health > Viruses – An Explanation About What They Are Viruses – An Explanation About What They Are Health Puzzle and Acitvity Books Share on Pinterest Professor Dave talks about viruses and what exactly a virus is. Are they alive and how do they infect a host spreading diseases? Share on Pinterest Activity Books for Preschoolers - for homeschooling or kindergarden classes Related Posts What is a Virus and how do they work? 30 Facts About The Human Body You May Not Know Seventeen Jaw Dropping Facts About The Human Body Where Did Viruses Come From? Why Do We Have Different Blood Types?