In the wake of Covid-19, children and parents are keen to understand – and be reassured about – viruses and other health issues. With over twenty years' experience of scientific research, Dr Paul Ian Cross sets out to answer all the questions we didn't know we needed answering until now. What does a virus look like? How does a virus get passed from person to person? How have viruses changed the world? And who are the men and women who have beaten them? With children leading the revolution, now is the time to understand the importance of making medicines … and how to vanquish a virus