Some of the most promising Covid-19 vaccines now being rolled out worldwide were developed on the work of 65-year-old Hungarian-born biochemist Katalin Kariko, who spent decades researching messenger ribonucleic acid (mRNA). The genetic molecules give instructions to cells about what proteins they make, an essential process for keeping the human body alive and healthy. Kariko’s pioneering work ultimately was a key element in the successful creation of the Pfizer-BioNTech and Moderna Covid-19…