The Hollywood sign. Credit: Matt PurdyIMAX, 3D glasses, VHS, technicolor… technology has continually reshaped Hollywood. But perhaps the biggest, most important change happened early in the industry’s history: the transition from silent films to talkies. Marc Wanamaker, a longtime Hollywood historian and consultant on films like “La La Land,” walks us through what happened, and how it forever transformed the silver screen. Three Takeaways: “The Jazz Singer” wasn’t actually the first talkie.