Mezuzah on a House that was Sold for Pesach

Putting a Computer on top of Seforim

Can a computer that has Torah on it (ie, Otzar Chochma, Bar Ilan) be put down on top of a sefer?

Raffles on Shabbos

Can you make a raffle on Shabbos? For Avos U'banim, bnos, or pirchei?

Wearing your Tzitzis: In or Out?

Should the strings of your tzitzis be visible or tucked away?

Sous Vide & Navel Pastrami on Shabbos

Is sous vide a violation of hatmanah (insulating) on Shabbos? What about navel pastrami or raw chulent pastrami? Is this any different than putting a kugel in your chulent?

Mezuzah on a House that was Sold for Pesach

Do you have to re-attach the mezuzahs on a house that was sold to a goy for Pesach?