On this week’s Tech Nation, Moira speaks with Journalist Stephen Witt discusses his new book, "The Thinking Machine: Jensen Huang, Nvidia, and the World’s Most Coveted Microchip", spotlighting Nvidia and its CEO, Jensen Huang. Then, Sean Ainsworth, CEO of Immusoft, explains how reprogrammed B-cells could change the way we treat chronic diseases. And Erica Dhawan, author of, "Digital Body Language", returns with four red flags in your digital communication style.