Five years after Covid-19 shut down activities all over the world, medical historians sometimes struggle to place the pandemic in context. What, they are asking, should this ongoing viral threat…
Five years — and hundreds of millions of cases — after the World Health Organization declared the Covid-19 pandemic, scientists are getting a clearer picture of how the virus can…
The C.I.A. has said for years that it did not have enough information to conclude whether the Covid pandemic emerged naturally from a wet market in Wuhan, China, or from…
