R. Hecht's Wednesday Night Shiur

In Memory of Harav Hachosid Sholom ben Yehoshua, Gavriel Elimelech z"l ben Binyomin Yoetz Sheyich"ye Harav Chaim Meir ben Alte Yissachar Dov z"l. Greek Philosophy, The name Yavan. Why did they desecrate the oil? How did Yosef's brothers not recognize him?