BREAKING NEWS: TOP HEADLINES DECEMBER 2024 ON ABC WORLD NEWS TONIGHT WITH DAVID MUIR

Good evening and welcome to ABC World News Tonight. I'm David Muir, bringing you the current headlines from around the globe.Tonight's top story: A critical breakthrough in the quest to find a cure for a widespread disease. Scientists at the NIH have made promising discoveries that could revolutionize medicine as we know it. In other news, a fier