"Tu" (the Hebrew abbreviation of 15th) in the month of Shvat was set (Hillel's opinion generally overrules Shammai's) as the beginning of the tithable year for tree fruit: Calculating the tithe on fruit starts again for fruit that sets after that date.
Here is the quintessential Jewish question: How do we emulate God? We are told that we were created by God. We are told that we have a divine spark within us.
Derived from central Europe, the popular kichlach (Yiddish for "cookies") are to be found in many of the packages prepared by parents for their children serving in the Israeli military.
The mechanism to connect the Exodus with the giving of the Torah is a simple one-counting the days.