The schools of Shammai and Hillel for the very first time disagreed regarding a case of Jewish law. This occurred around the turn of the 1st century. In the ensuing generations, the schools argued regarding many different laws, until the law was established according to the teachings of the "House of Hillel" -- with the exception of a few instances. According to tradition, following the arrival of the Moshiach the law will follow the rulings of the House of Shammai.
All throughout, the members of the two schools maintained friendly relations with each other.
After a 12-day sea voyage, the previous Lubavitcher Rebbe, Rabbi Yosef Yitzchak Schneersohn (1880-1950), disembarked at the New York harbor on the 9th of Adar II of 1940, following his miraculous rescue from Nazi-occupied Warsaw.
Links:
Vintage film clip of the Rebbe's arrival in NY, March 19, 1940
More about Rabbi Yosef Yitzchak of Lubavitch
The ancient Book of Formation teaches that there is more to the universe than time and space. There is a soul.
Whatever is found in the universe’s soul is found somewhere in its space. And whatever is found in space, is found in time.
In the soul of the universe there is a consciousness from which all consciousness extends.
In space, there is the Land of Israel, a space from which all space is nurtured.
In time, there is Rosh Hashanah, a time from which all time is renewed.
It is not just a starting point, but a head, a new beginning of time, when a new consciousness enters our universe.
As the head governs the body, so all that will transpire in the coming year is first conceived in these two days.