One infected person in Yemen, no deaths to lament! Every morning and throughout the day, we are bombarded with astonishing and contradictory data, the meaning of which often eludes us. Worldwide, 2.4 million people infected, more than 160,000 deaths; 760,000 positive cases and 40,000 deaths in the United States, the world's leading power! Some clarifications are in order: 1) Information related to Covid-19 depends on statistics. In the absence of statistics, there is a good chance nothing will be done. As far as the number of infections is concerned, this obviously depends on the number of tests being done: the greater the testing, the greater the likelihood of getting a picture close to the reality of the epidemic. 2) All figures being announced are provisional. The epidemic is still evolving. 3) The vast majority of infections end in full recovery. A small proportion of infected cases end up in hospital. And an even smaller...