
Why scientists are suddenly more interested in the lab-leak theory of Covid's origin
CNN
The United States is closer than ever to beating Covid-19, with half the country vaccinated and more restrictions lifting.
But we're as far as ever from knowing how this virus, which shut down the world, came to be -- which is as frightening as anything, since there's growing suggestions that it didn't just occur naturally, as many experts have long argued.More Related News