In early 2020, dozens of scientific teams scrambled to make a vaccine for Covid-19. Some chose tried-and-true techniques, such as making vaccines from killed viruses. But a handful of companies bet on a riskier method, one that had never produced a licensed vaccine: deploying a genetic molecule called RNA. The bet paid off. The first two vaccines to emerge successfully out of clinical trials, made
![This New Covid Vaccine Could Bring Hope to the Unvaccinated World (Published 2021)](https://cdn-ak-scissors.b.st-hatena.com/image/square/abc0bc22ac3db97ae8f8ca5a38ba09797a0a3409/height=288;version=1;width=512/https%3A%2F%2Fstatic01.nyt.com%2Fimages%2F2021%2F05%2F05%2Fscience%2F05VIRUS-CUREVAC1%2F05VIRUS-CUREVAC1-facebookJumbo.jpg%3Fyear%3D2021%26h%3D550%26w%3D1050%26s%3D90756147e949c2e8f831a01b5daefcce5b47e2e3a68782035d10c9c43146ab7d%26k%3DZQJBKqZ0VN)