According to some Poskim, such as I believe the Tzitzit Eliezer, It is permissible to be Yotzei havdalah or Megillah over telephone. My question is, on Yom Tov, if one holds by this view may one hear kiddush via the telephone as ochel nefesh (a type of normally prohibited action permitted on Yom tov for holiday needs).

The Torah in Vayikra 12:1-5 states a woman is separated like a niddah after childbirth. Does this law apply to egg donors whose eggs are fertilized in another woman?

In Halacha, is there an order of priority for who gets to wash Mayim Achronim first or last? So say multiple people are eating together, and one is a kohen or Levi or Talmid chacham or your parent, do you have to let them wash first (assuming everyone there practices it)? What if you finish eating before them?