Instructions in the Torah for the holiest person doing the holiest tasks on the holiest day in the holiest place are introduced with a real downer, by mentioning the two sons of Aaron who died when they brought an offering at the Temple's dedication. Rabbi Dunner explains why Acharei Mot begins with this depressing topic, and also offers a fascinating insight into the proximity of Yom Hazikaron to Yom Haatzmaut.