to the Talmud. Textual emendations The text of the Talmud has been subject to some level of critical scrutiny throughout its history. Rabbinic tradition holds that the people cited in both Talmuds did not have a hand in its writings; rather, their teachings were edited into a rough form around 450 CE (Talmud Yerushalmi) and 550 CE (Talmud Bavli.) The text of the Bavli especially was not firmly fixed at that time. Gaonic responsa literature addresses this issue. Teshuvot Geonim Kadmonim, section 78, deals with mistaken biblical readings in the Talmud. This Gaonic responsum states: In the early medieval era, Rashi already concluded that some statements in the extant text of the Talmud were insertions from later editors. On Shevuot 3b Rashi writes "A mistaken student wrote this in the margin of the Talmud, and copyists [subsequently] put it into the Gemara." The emendations of Yoel Sirkis and the Vilna Gaon are included in all standard editions of the Talmud, in the form of marginal glosses entitled Hagahot ha-Bach and Hagahot ha-Gra respectively; further emendations by Solomon Luria are set out in commentary form at the back of each tractate. The Vilna Gaon's emendations were often based on his quest for internal consistency in the text rather than on manuscript evidence; nevertheless many of the Gaon's emendations were later verified by textual critics, such as Solomon Schechter, who had Cairo Genizah texts with which to compare our standard editions. In the 19th century, Raphael Nathan Nota Rabinovicz published a multi-volume work entitled Dikdukei Soferim, showing textual variants from the Munich and other early manuscripts of the Talmud, and further variants are recorded in the Complete Israeli Talmud and Gemara Shelemah editions (see Critical editions, above). Today many more manuscripts have become available, in particular from the Cairo Geniza. The Academy of the Hebrew Language has prepared a text on CD-ROM for lexicographical purposes, containing the text of each tractate according to the manuscript it considers most reliable, and images of some of the older manuscripts may be found on the website of the National Library of Israel (formerly the Jewish National and University Library). The NLI, the Lieberman Institute (associated with the Jewish Theological Seminary of America), the Institute for the Complete Israeli Talmud (part of Yad Harav Herzog) and the Friedberg Jewish Manuscript Society all maintain searchable websites on which the viewer can request variant manuscript readings of a