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Нашёл на каком-то еврейском форуме:
According to Mishna Hala 3:7, Mishne Tora Hilkhot Bikurim 6:1, Shulkhan Arukh OH 453:2, etc. there is a big difference between rice (orez) and millet (dokhan). Rice requires the "mezonot" brakha and can become halakhically leavened when in contact with wheat flour. However, Rashi has claimed that the terminology has gotten confused, and that today's orez is the talmudic dokhan and vice versa! The akharonim remained undecided on the issue for quite a while.
T'shuvot ve-hanhagot Hayei Adam 186, sefer Ve-Zot ha-Brakha p. 241, relates the following: Gaon R' Eliyahu mi-Vilna (the Vilna Gaon) decided to settle the controversy experimentally. TB Bava Metzia 40a states that when one keeps someone else's grain mixed with his own, upon return he can deduct an estimate of what the mice have eaten. The Gemara states that this amount is 1/20 for dokhan, and 1/40 for orez. The Gaon had a measured amount of millet and rice stored for a year, and determined that the mice ate 1/20 of the millet and 1/40 of the rice. Based on this experiment, he ruled that there was no confusion in the terms, and the Gemara means rice by orez, etc.
According to Mishna Hala 3:7, Mishne Tora Hilkhot Bikurim 6:1, Shulkhan Arukh OH 453:2, etc. there is a big difference between rice (orez) and millet (dokhan). Rice requires the "mezonot" brakha and can become halakhically leavened when in contact with wheat flour. However, Rashi has claimed that the terminology has gotten confused, and that today's orez is the talmudic dokhan and vice versa! The akharonim remained undecided on the issue for quite a while.
T'shuvot ve-hanhagot Hayei Adam 186, sefer Ve-Zot ha-Brakha p. 241, relates the following: Gaon R' Eliyahu mi-Vilna (the Vilna Gaon) decided to settle the controversy experimentally. TB Bava Metzia 40a states that when one keeps someone else's grain mixed with his own, upon return he can deduct an estimate of what the mice have eaten. The Gemara states that this amount is 1/20 for dokhan, and 1/40 for orez. The Gaon had a measured amount of millet and rice stored for a year, and determined that the mice ate 1/20 of the millet and 1/40 of the rice. Based on this experiment, he ruled that there was no confusion in the terms, and the Gemara means rice by orez, etc.
