There is a tradition of eating pomegranates during Rosh Hashana because of the many seeds they contain. Some people have the tradition that they contain 613 seeds which matches the 613 mitzvot in the Torah. Also, on Rosh Hashana, Jews eat apples dipped in honey, to symbolize a sweet new year.
Please see the related link for an alternate explanation regarding pomegranates and Rosh Hashana.
Rosh Hashana begins the evening of Sept 28, 2011.
Rosh Hashana
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ראש השנה‎
Rosh HaShana isn't made out of anything, it's the Jewish New Year.
Rosh haShana
17-18/Sep/2012
i believe it is on the 9th of September
Selichot are special prayers said during the days before Rosh Hashana. Selichot are prayers about forgiveness. These prayers are said early morning before Shacharit; the daily morning prayers. Sefardim start saying Selichot a month before Rosh Hashana; the entire month of Elul. Ashkenazim begin saying Selichot on the Sunday before Rosh Hashana; unless Rosh Hashana is on Monday or Tuesday, in which case they start saying Selichot on the Sunday 10 days before Rosh Hashana. Selichot are said until Yom Kippour. Selichot are not said on Shabbat.
According to Jewish tradition, God judges the world on Rosh Hashanah.
Rosh Hashana is the Jewish new year, it doesn't related to WW2.
Rosh Hashanah is on Rosh Chodesh. What you mean to ask is, What are the days between Rosh Hashanah and Yom Kippur. These are the Aseret Yemai Teshuvah, the Ten Days of Repentance.