Today's daf is dedicated by Gabrielle and Daniel Altman in honor of their wonderful nephew Eliyahu Stark on his upcoming wedding to Ariella Weiss. What is the difference in the case of Shabbat and Yom Tov that fall out one after the other between one who puts out bread/food for an eruv and one who stands at the spot where one wants to designate as one's eruv? How do we understand the nature of the two days of Rosh Hashana - are they considered the same as two days of other holiday in the Exile, meaning one only day is sanctified and we don't know which one. Or is it treated as one sanctity. Ramifications of this debate are for making two eruvs - one for each day in a different direction or tithing produce with a stipulation: If today is not Rosh Hashana, then I will separate today..., and for an egg that hatched on the first day, can one eat it on the second day? Does one add in their prayers a stipulation that maybe today is the first day of the month or maybe it is tomorrow? Rabbi Yosi who forbids stipulations, would he differentiate between Rosh Hashana and two days of Yom Tov on other holidays in the Exile? An incident happened in the house of the Exilarch and Rav Sheshet disagreed with Rav Nachman and was later proven wrong but doesn't want word to get out to Rav Nachman of his mistake.