Mask disinfectant residue will cause cancer, shake before use? In December 2021, the "Science" gossip list was released

The monthly "science" rumor list is guided by the Beijing Municipal Association for Science and Technology, the Cyberspace Administration of the Beijing Municipal Party Committee, and the Capital Internet Association, and is jointly released by the Beijing Science and Technology Journalists and Editors Association and the Beijing Regional Website Joint Rumor Dispelling Platform, and supported by the Science and Technology Journalists and Editorial Committee of the China Association of Popular Science Writers, the China Evening News Science Editors and Journalists Association, the Shanghai Science and Technology Communication Association, and the Beijing Institute of Science and Technology Information.

1. Mask disinfectant residue will cause cancer, shake before use

gossip:

Mask disinfection residue "ethylene oxide" is a class of carcinogens, after opening the package to shake the mask in the air, so that the value of ethylene oxide drops significantly, otherwise it will cause cancer.

The truth:

Ethylene oxide is an organic compound, it is indeed a toxic carcinogen, can be used to make fungicides, is widely used in washing, pharmaceutical, printing and dyeing and other industries.

Most of the medical surgical masks and N95 masks that can be purchased on the market are sterilized by ethylene oxide disinfection steam fumigation. Mask manufacturers will disinfect and wait for ethylene oxide to volatilize before packaging. In addition, residual ethylene oxide will be tested, and the mask must meet the national standard, that is, less than 10 μg/g to leave the factory.

A mask, from the packaging, to ethylene oxide sterilization, and then in the factory after the analysis time, and then out of the factory, storage, transportation, sales, until to the hands of consumers, at least to experience a month of time, and ethylene oxide itself is volatile, the factory has met the national standards, coupled with such a long period of volatilization, there is a residual and harmful health possibility, is really "minimal."

The ethylene oxide residue of the tested mask samples in the video is lower than the national standard, which does not pose a threat to the wearer's health. When buying masks, you must choose products produced by regular enterprises, and the residues meet national standards and will not pose a threat to the health of the wearer.

2. Shrimp and fruit will produce arsenic

After shrimp and fruit are eaten at the same time, the arsenic pentoxide contained in the shrimp will chemically react with the rich vitamin C in many fruits in the body to produce arsenic trioxide, that is, "arsenic", which may be fatal.

Through a large number of experiments, scientists have found that there is not much arsenic in seafood such as shrimp and crabs, and the content of arsenic pentoxide in each kilogram of shrimp does not exceed 0.5mg. The dose of arsenic (arsenic trioxide) that causes poisoning is 50mg, according to the conversion coefficient, if the arsenic contained in shrimp reaches a maximum limit of 0.5mg/kg, and there is enough vitamin C to react with it, a person needs to eat at least 40 kg of shrimp to reach the poisoning dose. Imagine, 40 kg of shrimp + enough fruit, how can a person's stomach be able to hold it? In fact, there is no such thing as "food phase" in both TCM theory and modern medical theory.

3. The Omikejong mutation can evade the COVID-19 test, and infected people cannot detect it

The Omikejung strain has an "invisible variant" that can evade COVID-19 testing, which cannot be detected by infected people.

The World Health Organization confirmed at the end of November 2021 that the PCR test, the gold standard for confirming the new crown, can detect the Opichron variant.

PCR testing is generally to measure the new crown of two and three gene sequences, a mutation in the S protein of Theomilon - amino acid deletion at position 69-70, will lead to the PCR detection of the S gene can not be detected, but the other two gene fragments are positive, it should be noted that this result is still positive, infected with Omilon people can still be measured. Moreover, with this method, it can be reversed, through the deletion of the S gene, to quickly detect how many of these positive cases are The Omilon variant. The Case of Omi kerong in South Africa is also mainly inferred by the deletion of the S gene.

Recently, British scientists have found that there are actually two branches of Omikeron, one branch does not have the amino acid loss of position 69-70, which is jokingly called "invisible" Omikeron. But no matter which branch, it will not evade PCR detection, but there is a difference in whether it can be determined whether the virus is Omi kerong through PCR detection.

4. After the data cable is damaged, it will not affect the use of insulating tape wrapped up

The data cable will be damaged after a long time, and as long as the damage is wrapped with insulating tape, it can continue to be used.

Experiments have found that old charging data lines are more likely to short circuit, resulting in open flames. In recent years, fire accidents caused by improper charging of mobile phones have occurred frequently.

Avoid old, inferior charging cables. High-quality charging data cable can be used normally in different scenarios, some of the interior also has a shielding layer, tensile fiber, etc., will greatly improve the quality of the data cable; high-quality charging data cable durability is excellent, with good flame retardant performance and corrosion resistance, not only safer in the use of the process, the use cycle will be longer.

How to judge whether the data cable should be changed? One look at whether the appearance is damaged; the second is to see whether there is poor contact when charging; and the third is to see whether there is overheating at the terminal interface (overheating indicates that there is a problem with insulation). In the above situation, it is necessary to replace the charging data cable.

In addition, the frequency and habits of use will affect the life of the charging data cable, and consumers should judge whether the data cable has aged by appearance observation, reaction speed when charging and charging success rate. Once performance degradation or aging is found, it should be replaced in time. When purchasing a charging data cable, you must also choose a high-quality charging data cable that meets the standard and professional certification, and it is best to use the "official standard" charging data cable.

5. The hot water of nuclear heating carries radiation

The hot water of nuclear heating carries radiation, and if the heating pipe leaks, the consequences are unimaginable.

The heat generated by the nuclear reaction first enters the homes of residents after being converted by layers of media, so there is no radiation in the heating pipes.

Like thermal power plants, nuclear power plants can also achieve "cogeneration", that is, to generate electricity and heat supply. The heat generated by the nuclear power plant will be "multi-stage heat exchange" through the heat exchange station in the factory and the heat exchange station of the heat exchange enterprise outside the plant, and finally the heat will be transferred to the end user through the municipal heating pipe network. In the whole process, there are only two modes of "steam heating water" and "water heating water", and there are multiple circuits between the nuclear power plant and the heating user, and there is only heat transfer between each circuit, there is no water exchange, and there will be no radioactive material entering the user's heating pipe.

6. The more natural snowfall during the Winter Olympics, the better

Snow is inseparable from the Winter Olympics, so the more natural snow falls during the game, the better, and artificial snow is only a backup plan.

For high-profile Winter Olympic events, artificial snow is not a backup option, but the main option. In areas where there is snow all year round and where there is a lot of snowfall, the tracks for winter events are still artificially snowcast. At this time, natural snowfall is a "burden".

The advantage of artificial snow is that the snow quality is more controllable, its formation time is short, the growth is fast, and the shape of the snowflakes is basically the same. In particular, the high-quality "ice-like snow", hardness, not easy to be destroyed, in the case of athletes turning at high speed can ensure that the surface of the slope is not deformed, no matter how many players appear, the state of the slope is relatively perfect. In addition, according to the needs of different events and different venues, artificial snow can be freely "customized", and the particle size, moisture content and hardness of snowflakes can be adjusted.

In contrast, natural snowfall is relatively soft, and athletes' snowboards are very easy to fall into the snow, causing accidents such as rollovers and emergency stops. Therefore, if there is snow during the event, the soft natural snow will lead to the failure of the "smooth as a mirror" track.

Therefore, if you really encounter "the sky is not beautiful", the staff will immediately use the snow groomer to re-compact the snow track, and make emergency decoration of the track, and will also use automatic measuring instruments such as ice and snow hardness meter and ice particle size meter for quick testing, so as to effectively ensure that the snow quality is qualified.

7. When myopia is old, you will not get presbyopia

Myopia is not clear from a distance, presbyopia is not clear from close range, so myopia will not get presbyopia when you are old.

Myopia is mostly a genetic factor or long-term poor eye habits that cause the refractive effect of the cornea and lens to weaken, which in turn focuses parallel light in front of the retina, making it difficult for people to see distant objects clearly. Presbyopia is due to age, the lens gradually hardens, the elasticity is weakened, and the contractile function of the ciliary muscle is reduced, which in turn impairs the visual adjustment function and makes people unclear when looking at near objects.

Presbyopia is not a disease, but a natural decline in the ability of the human eye to regulate, which is a normal functional degradation. Presbyopia usually occurs slowly, starting around the age of 45 and generally becoming stable by the age of 65 to 70. This is a condition of aging of the body and is irresistible.

Therefore, there is an essential difference between myopia and presbyopia from a pathological point of view, myopia is caused by refractive errors, while presbyopia is caused by lens degeneration and loss of elasticity. People who originally had myopia, and after old age, there are old flowers, they will face the problem of "looking at the distance and seeing the near and the near are not clear", then it is necessary to prepare two pairs of glasses with different degrees or choose to wear progressive multifocal glasses.

Sources for this issue:

Xinhua Daily, Science Popularization China, Tencent More True, "Beijing Evening News" WeChat public account, Beijing Science and Technology News, "rumor dispelling platform" WeChat public account, "rumor filter" WeChat public account