In the days before e-mail, transmitting from, say, the great academies of Babylonia to Jewish centers in France and Spain was arduous, not to mention dangerous. Rav Hai Gaon was the last of the Babylonian Gaonim. His travels brought the knowledge of the Babylonian Academy into Europe. Noted Jewish historian Berel Wein takes you on this essential journey that marked a new era in the development of halacha.