In May, COVID-19 had another wave of sense of existence. While resisting COVID-19, we should also be alert to those "rumor viruses" with low cost and fast spread. Rumors such as eating bamboo charcoal food to detoxify and beautify, only charging mobile phone batteries 500 times, damaging the environment due to carbon dioxide sequestration at sea, and the arrival of the "super high-speed rail" have brought great anxiety to people. Today, the reporter of Science and Technology Daily will take stock of the rumors in May one by one to help you clear the fog and find the truth. Eating bamboo charcoal food for detoxification and beauty enhancement? Truth: On the contrary, it can cause problems such as indigestion. In the past few years, bamboo charcoal peanuts became popular, and this year, bamboo charcoal drinks with a focus on super cool "industrial style" made their debut. In addition, there are also bamboo charcoal cakes, bamboo charcoal bread, bamboo charcoal thousand layers and other bamboo charcoal foods on the market. There is a saying online that bamboo charcoal can adsorb harmful substances in the human body, help clean the intestines, and have the effect of detoxifying and nourishing the skin. In response, Wang Hao, a professor of the School of Food science and Engineering of Tianjin University of Science and Technology, said in an interview with Science and Technology Daily that the detoxification effect of bamboo charcoal food lacks a strong scientific basis. In daily life, bamboo charcoal itself has an adsorption effect and can be placed indoors or in a refrigerator as a hygroscopic agent, deodorant, etc. The molecular diameter of bamboo charcoal is very large, and particles of this size are unlikely to be absorbed by the human body. When this substance enters the human body, it is likely to be excreted as is, so it not only does not have the effects of cleaning the intestines, detoxifying and nourishing the skin, but also affects the absorption of nutrients, causing problems such as poor digestion and constipation. "Wang Hao said that the human body has its own metabolic system, Harmful substances that enter the human body can be eliminated through the normal metabolic system, and there is no need to use bamboo charcoal food to "detoxify". Wang Hao emphasized that bamboo charcoal has not yet been included in the "National Food Safety Standard for the Use of Food Additives" (GB 2760-2014). Therefore, currently in China, adding bamboo charcoal as an additive to food is illegal. For bamboo charcoal food, consumers should be cautious, "he reminded. Can mobile phone batteries only be charged 500 times? Truth: The better the usage habits, the more charging times there are. Nowadays, many people keep their phones connected and need to charge them every day. It is rumored on the internet that "mobile phone batteries can only be charged 500 times, and then they will die." Therefore, many people believe that it is necessary to minimize the number of times the phone is charged. Ji Kemeng, associate professor of the School of Chemical Engineering of Tianjin University, said in an interview with Science and Technology Daily that the current batteries used in smart phones are basically lithium-ion batteries, which use lithium compounds as cathode materials and artificial graphite as cathode materials. The charging and discharging process of lithium-ion batteries is the process of lithium ions repeatedly embedding and disembedding in the positive and negative electrode materials. In theory, as long as the structure of the positive and negative electrode materials and the electrolyte used in lithium-ion batteries are stable enough within their operating voltage range, mobile phone batteries can achieve infinite charging and discharging cycles. "Ji Kemeng introduced that in laboratory constant temperature testing, batteries can achieve stable charging and discharging cycles of more than two to three thousand times. In practical use, mobile phone batteries can usually only achieve 500 to 1000 charging and discharging cycles (about 3 cycles can be used)