Question
If you have a hot water urn that you set before Shabbat, and then during Shabbat, the power goes out and the water cools down, and then later, the power returns and the water is reheated without any human intervention, is it permitted to use that hot water on Shabbat?

Question
By Halacha, is Lashon harah about noahides prohibited? I ask partially since I recently saw two older (jewish) individuals who I recall face to face confronted (aggressively) a young gentile who tried wearing a kittel to a Yom Kippur service I attended (he apparently had permission from the rabbi of the shul, so they were offended and I believe gossiped until they forced him to take it off lest he be kicked out), was such behavior against Halacha?