At its height, ISIS recruited and trained children to fight for its cause. Some participated in atrocities and appeared in propaganda videos. Others were brought to the so-called caliphate by their parents or they were born there. We hear about one young man from Trinidad who has been stuck there for 5 1/2 years. And, European police have busted a criminal ring that over a period of two years stole rare books by famous Russian authors from libraries across Europe. Europol says it has arrested four Georgian nationals in Georgia and Lithuania who are thought to have collaborated in the plot. Also, global average sea-surface temperatures have set records for more than a year straight. It's incredibly anomalous, and worrying for everything from marine life to hurricane season. Plus, a Venice tourist tax. Listen to today's Music Heard on Air.