In A Shot in the Arm, MIT Professor Yossi Sheffi recounts the extraordinary journey to deliver Covid-19 vaccines: from scientific advancements to candidate vaccines and mass vaccination. It is a story of bold innovation, risk-taking, and teamwork as scientists, engineers, supply chain experts, manufacturers, and governments collaborated on the greatest product launch in history. The book also highlights the breathtaking potential of revolutionary mRNA technology and the vital lessons for combating other global challenges, including climate change.