Kathryn A. Whitehead, an engineer who spoke at TED Monterey 2021, dives into the world of lipid nanoparticles—tiny fat balls designed to deliver critical medicines to our cells. She highlights how these nanoparticles are integral in mRNA vaccines, revolutionizing treatment methods for diseases like Ebola, HIV, and cancer. The discussion focuses on the challenges of safely delivering mRNA and the groundbreaking advancements that have accelerated since the COVID-19 pandemic, promising a new frontier in healthcare.