Hundreds of captured Russian soldiers, conscripts and mercenaries are being held in 50 sites around Ukraine. Russia also has Ukrainian POWs captured from the war. Frequent prisoner exchanges are a sign of direct talks between the two countries. And, in Ukraine's southern region of Kherson, evacuations are underway to get residents out of areas affected by flooding caused by the destruction of the Kakhovka dam. Also, hip-hop turns 50 this summer. The World launches "Planet Hip Hop" to celebrate its influence in all corners of the globe. Plus, scientists get a thrilling new look at the Earth's mantle.