The SARS virus swept across the country in 2002, and there were overwhelming news reports on TV and newspapers. That year Chen Xuan was seven years old and had just entered elementary school. Xu Chuyan became Chen Xuan's tutor in his first year of college. By the time people found out that the source of the SARS virus came from a type of bat called the horseshoe bat, it was already 2013, when Chen Xuan was in his senior year of high school. The summer after I graduated from high school...