Jewish Holidays

What is the reason that many people use a hard-boiled egg for eruv tavshillin? In what way is the halacha of eruv tavshillin different on Shavuos and Shevi’i shel Pesach from other Yomim Tovim?

I sometimes get confused in the Kiddush of Yom Tov that falls on Shabbat. What does one do if he did not say all of the correct elements?

Many have discussed the nature of Avraham’s sin of asking, “How will I know [my progeny will inherit the Land]”? Avraham speculated whether his children would succeed in handling the gift of the Land in a way that they would live an independent national life in it.

As a nation, we have always maintained the highest moral code. Even under the greatest duress, when we have been discriminated against & treated cruelly, we did not respond in kind.

I have heard that it is a problem if part of a matza is folded over (matza kefula). How much of a problem is this, and what do I do about it?