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Hi, I'm wondering if it is permitted to write one's name, last name or something similar on the inside cover of a religious book and if so is there a specific way one should do this? Thank you

Question
I would like to know if I invite people to a business lunch and there is a Jew between them, and the Jew orders a non kosher meal, if it is ok ​for me to pay for the meal. Thanks

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Hi, I have lettuce that I grew using hydroponics (not in the earth/dirt) can o use it for my seder? I’ve heard some say since it’s bracha is shehakol better not to use it… do we hold its bracha is shehakol? And can it be used lechatchila for the seder?

Question
I just read that one who disgraces Chol Hamoed loses their share in Olam Haba. I have also read the same about many other acts. Suppose one is well compliant with every law of the Torah, except for one, and the one law he fails to observe is one that it is taught one loses their share in Olam Haba. Does he still lose his share in Olam Haba, even if he observed every other mitzvah perfectly?

Question
If a mother has a large percentage of Ashkenazi ancestry, but never practiced Judaism, is she still a “Jew”?