Today's daf is sponsored by Avi Mimun in honor of his wife Joy on their 19th year anniversary. "Joy, your love for Torah learning is a source of inspiration and blessing for me and the kids. I’m so proud of your accomplishments and wish you to be able to complete the entire Shas. I’m lucky to be married to the most amazing woman in the world! Love you very much!"  Today's daf is sponsored by Julie Mendelsohn in honor of her son Raphael who is drafting into the army tomorrow. "May Hashem bless you and keep you, and may you return home safely along with all חיילי צבא הגנה לישראל. It was amazing to see you finish the Shas mishnayot last month. The next daf yomi cycle, you’re going to join me and finish the whole Talmud b’ezrat Hashem (and b’li neder)!" Today's daf is sponsored by Mitzi and David Geffen in loving memory of Mitzi's mother, Ruth Toll Lock, Rut bat Miriam and Avraham z"l on her 37th yahrzeit. "She was a loving mother, mother-in-law, and wife; and a devoted Zionist and wonderful educator in Harrisburg, PA. All of her 4 children made Aliyah and her many grandchildren and great-grandchildren all live in Israel!"  If there is a doubt about whether one came in physical contact with an impurity that is floating in water, even in a private domain where one is generally strict about impurity that is in doubt, we are lenient. There is a debate about whether this only applies to water attached to the ground or even to water in a vessel. From where is this law derived and from where does each opinion find proof in the verses? Rami bar Hama asks a slew of questions regarding an impure item floating on top of something else that is floating - it is considered on solid ground (and one who was in doubt if they came in contact with it would be impure) or would it be considered floating (and would be pure). His questions remain unanswered. Rav Hamnuna limits the case in our Mishna where tumat tehom applies to one who is impure, to a case where they did not complete yet their purification process, but if they did, even if they were still waiting for the sunset to fully complete the process, they would not be considered to have the presumptive status of impurity. Abaye questions the issue about waiting for sunset as he thinks one would still be considered to have the presumptive status of impurity. Although, the Gemara points out that Abaye himself changed his mind on this issue and proves it from his comments on an entirely different situation regarding the sacrifices a woman brings after childbirth.