Which is the real Adar? This affects when to celebrate Purim, when to observe a yahrtzeit, and when a child becomes bar/bat mitzvah.
Why is Adar always the added month?
Do we view Adar as months 12A and 12B or a 13th month (really called חדש העיבור)?
What if someone was born on the 30th of Cheshvan and he becomes Bar Mitzvah in a year without a 30th of Cheshvan? When does he become an adult? How does that apply to someone born in Adar Sheni of a leap year who becomes Bar Mitzvah in a non-leap year?
Delivered at the OU Israel Center, February 6th, 2019, 1 Adar Aleph 5779