Tisha B’Av, is the Jewish 9/11 (9th day of Jewish 11th month called Av). Many Jewish calamities befell our people on this day: both Holy Temples in Jerusalem were destroyed on this day, Jews were expelled from England in 1290 and from Spain in 1492 on this day etc etc The message of both 9/11s: Don’t allow yourself to fall back to sleep! Mendel Bluming