National Geographic is kicking off an all-new, 13-episode season of EXPLORER covering a variety of topics, including cloning, our nation’s nuclear threat,  and the downside of DNA testing. Award winning journalist Mariana van Zeller joins Tim to share her story about visiting the underground tunnels of Gaza. This troubled region has found a way to transport terrorists...and also to move human wants, like wedding dresses. Hear the good, the bad and the ugly moving in and out of Israel.