When the world speaks of Middle Eastern refugees, it means Palestinian Arab refugees. The truth is that there were more Jews displaced from Arab countries since 1948 than Palestinians from Israel (856,000, as against 711,000, according to UN figures). Some people call the Jewish Exodus The Greatest Story never told. Meet Lyn Julius, author of "Uprooted: How 3,000 years of Jewish civilisation in the Arab world vanished overnight".