WORLD · SCIENCE · HEALTH
December 14, 202032 min read, 6314 words
Published: December 14, 2020 | 32 min read, 6314 words
In fall of 2019, exactly zero scientists were studying COVID‑19, because no one knew the disease existed. The coronavirus that causes it, SARS‑CoV‑2, had only recently jumped into humans and had been neither identified nor named. But by the end of March 2020, it had spread to mor...