The saddest period in the Jewish calendar, when we mourn the destruction of the Holy Temple – amongst a litany of other national tragedies – is commonly referred to as 'The Three Weeks'. Yet, our Sages referred to this period as '21 Days'? The answer to this innocuous question reveals an astounding new depth to both the mourning period and its inevitable resolution. (Based on Sefer Hasichos 5750)