China has started a census to collect information about the nation’s estimated 1.4 billion population, including data such as the identity number, gender, marital status, education and profession of each individual. The survey officially starting on November 1, 2020, is China’s seventh national census since the first one was done in 1953. To contain the spread of Covid-19, census officials are encouraging Chinese residents to scan a QR code and fill in demographic information on their mobile…