Abu Bakr al-Baghdadi, the world’s most notorious terrorist, died during a raid by US military forces on Saturday. The former ISIS leader’s death put an end to a years-long hunt. Vox's Jennifer Williams joins Today, Explained to discuss where this leaves ISIS: spoti.fi/32Wi9UC | Vox

10 February 1258, on this day, the Fall of Baghdad and Islamic Golden Ages Ended. In 1258 Mongols under the command of Hulagu Khan sacked Baghdad, destroying the House of Wisdom, the leading library in the ultimate intellectual center of the Arab world. The House of Wisdom, founded in the eighth century, contained countless precious documents accumulated over five hundred years. Survivors said a large number of books were thrown into the river that the waters of the Tigris ran black with ink; ot