On this day, 29 years ago, July 5, 1998 (May 12, the lunar calendar, 1998), a cloned cow was born. Two cloned calves On July 5, 1998, Japanese scientists announced that two calves they cloned using adult animal somatic cells were successfully born on the 5th. When announcing the results, the Ishikawa Prefecture Animal Husbandry Comprehensive Center in Japan and the Animal Science Laboratory of Kinki University pointed out that the two calves were successfully cloned using the same cell nuclear transfer technology used for cloning Dolly Sheep. Researchers from these two institutions removed somatic cells from the fallopian tubes and the inside of the uterus of adult female cattle. After 5 days of serum culture, the nuclei of the somatic cells were transplanted into eggs from which the nuclei had been removed beforehand, and then used electrical stimulation to promote the fusion of the two, and after 8 days of in vitro culture, embryos were cultivated. On November 13 last year, the researchers transplanted 10 such embryos in pairs into the uterus of five cows. As a result, all five cows were pregnant, and two of them were pregnant with twins. The two cloned cattle born on the 5th were cloned using fallopian tube cells. They weighed 18.16 kg and 17.26 kg respectively at birth. Scientists have not yet named them. Four other cows carrying cloned cattle are scheduled to give birth in mid-August. Dolly the cloned sheep was born at the Roslin Institute in the UK last year and compared with two cloned animals. These two cows are the first animals to be successfully cloned using adult animal somatic cells since the birth of Dolly the Sheep on July 5, 1996. Over the past year or so, people have gradually reached a relatively consensus after heated debates on cloning technology. Many people believe that the breakthrough in cloning technology is a major scientific and technological achievement. Human beings have the ability to correctly use this technology like other technologies and to prevent it from harming humans. In addition, people urgently require the international community to formulate relevant international laws to regulate the research and application of this technology so that it can maximize the benefit of mankind. The British Science and Technology Council issued a report in March last year, pointing out that as far as we know, cloning technology can benefit mankind in at least five aspects: promoting human understanding of the mechanisms of biological growth and development, especially discovering factors that affect growth and aging; providing suitable organs for transplantation surgery; mass production of biological raw materials for the manufacture of certain drugs; providing more suitable animals for scientific experiments; and cultivating excellent breeds of livestock and poultry. So how can we effectively prevent the risks of cloning technology and allow it to maximize the benefits of mankind? Some experts believe that at present, to achieve this, the primary prerequisite is that the international community formulates and improves relevant international laws, and at the same time, countries formulate their own corresponding laws in accordance with international law and establish temporary control agencies at all levels. Earlier this year, an American scientist proposed a plan to clone humans, which was condemned by people of insight around the world. Ian Wilmot, chief scientist of Clone Dolly, believes that judging from the current level of technological development, the technology of cloning humans may be available within a few years. Dolly the cloned sheep has become the most eye-catching animal in the world