"AI wouldn't exist without Nvidia. Not in its current form." So says Stephen Witt, a journalist and author of the book The Thinking Machine: Jensen Huang, Nvidia, and the World' Most Coveted Microchip.In this podcast, Andy Cross, The Motley Fool's chief investment officer, and Motley Fool contributor Jose Najarro caught up with Witt for a conversation about:What Jensen Huang is afraid of.Whether anything can stop the current capital expenditure (capex) cycle.Where Nvidia's next $3 trillion in market cap cou ...