Nerdiest episode yet. Yemeni scientist Hashem al-Gaili weighs in on the latest science, and the big challenges for science in the Arab world.

Executive producer and seasoned journalist Rasha Elass brings you stories from the Arab and Muslim world that you are unlikely to hear elsewhere. Guests include an Egyptian atheist preacher, a former political detainee in one of Syria's notorious prisons, and readings from a little known Arabic text that was written in medieval Islamic times in the 10th century.