Episode 317

Biden playing "central role" in Gaza hostage negotiations, White House says. Second group of Hamas-held hostages freed after long delay. Derek Chauvin, ex-officer convicted of murdering George Floyd, stabbed in prison. Inmates graduate from first-of-its-kind college program. Russia launches its largest drone attack on Ukraine since start of war. Pro-Palestinian protesters march in London. For first time, researchers use artificial intelligence to build a robot.