The COVID-19 vaccines from Moderna and Pfizer are in many ways modern miracles. As you know by now, they were developed using technology called messenger RNA, or mRNA, which basically gives the body instructions to create antibodies for the novel coronavirus. It’s the first time a vaccine has been developed in this way. And now that we have this technology, we can start using it on all kinds of viruses, like the flu. Molly speaks with Andrew Hessel, a geneticist and microbiologist. He co-founded Genome Project-write, an international research effort.