Who is “Patient No.1” in Hebei? Where does the source of infection come from? Why are dozens of cases added in just a few days? Do wedding banquets and village collective activities lead to clustered epidemics? There is still no definite answer. On January 2, 2021, a 61-year-old villager in Xiaoguozhuang Village, Gaocheng District, Shijiazhuang City was diagnosed with COVID-19. …