The economist offers useful rules to help understand the data behind the headlines. "From remote working to online shopping, Covid-19 has been a great accelerator of pre-existing trends. One phenomenon it has supercharged is our love-hate relationship with statistics, data and algorithms. The threat of the pandemic has made us crave data: millions pore over R numbers; the technicalities of vaccine trials and testing accuracy, once of interest only to biostatisticians, are front-page news." The Financial Times' Tim Harford helps us understand these statistics.