My understanding is that wine or grape juice is s'tam yenam and forbidden if handled by non-Jews without having been cooked. (See, e.g., an explanation on chabad.org.) The practical result of this, ...
I noticed that the names of some Masechtot have an Aramaic plural ending - nun - such as "Gittin", while others have a Hebrew ending - mem - such as "Bikurim". Was there some pattern or logic in ...
When my kids were in yeshiva, the school had a policy that they were not allowed to wear kippot that had any writing other than their name, or "Yerushalayim" or something similar. I.e. - no logos like ...