[quick news] on May 21, 2019, the world will adopt the new international system of units: "second", "meter" and other "constant" will be used to replace the original device

The world will adopt a new international system of units: "constant" will be used instead of the original device, such as "second" and "meter" Since May 20, the world will adopt a new international system of units, and the seven basic units of time unit "second" and length unit "meter" will all be changed from the original device to the constant definition This is the most significant change in the international system of units (SI) since it was founded in 1960, marking that its definition is no longer related to physical objects, but based on the definition to reproduce unit values According to the direction of the president of the Chinese Academy of metrology, the international system of units is an internationally used measurement language developed from the "metric system", and it is a ruler for human beings to describe and define everything in the world The new definition replaces the original object with the constant of nature and guarantees the long-term stability of the international system of units "Definition constant" is not limited by time and space and human factors, which guarantees the objective universality of the international system of units The new definition can be reproduced in any range, which guarantees the accuracy of the international system of units Experts said that the primary work to be done after the new international system of units came into force is just to ensure that the measurement of ordinary users, people in the industry and researchers is still continuous and stable Http://news.scienceet.cn/htmlnews/2019/5/426500.shtm World Health Assembly opened on May 20, focusing on universal health coverage At the United Nations Palais des Nations in Geneva, Switzerland, delegates attended the opening ceremony of the World Health Assembly The 72nd World Health Assembly opened in Geneva on the 20th This conference will focus on the theme of "health coverage for all: no one is left out", and promote countries around the world to take practical actions to implement health coverage for all World Health Organization director general Tan Desai said in the opening speech of the conference that through strong primary health care, countries can prevent, detect and treat non communicable diseases, and can detect and prevent sudden diseases before they constitute an epidemic He urged states to make concrete commitments to ensure that no one is left out in the process of achieving universal health coverage This session of the General Assembly will be held from the 20th to the 28th According to the agenda, in addition to primary health care, the General Assembly will also discuss specific topics such as access to drugs and vaccines, antimicrobial drug resistance, and implement action support for universal health coverage In addition, the conference will also focus on the price transparency of drugs, vaccines and other medical products Http:// research shows that diabetes may increase the risk of multiple cancers for a long time, people have been guessing that there is a certain relationship between diabetes and cancer, but the results of previous studies are often inconsistent A new study in China shows that type 2 diabetes can increase the risk of multiple cancers, including 11 cancers involving men and 13 cancers involving women Researchers from the medical school of Shanghai Jiaotong University and other institutions used the information of relevant databases in Shanghai to carry out the "largest" Research on the relationship between type 2 diabetes and cancer risk The researchers first identified more than 410000 adults with type 2 diabetes who had no history of cancer between July 2013 and December 2016, and then followed up the patients to December 2017 to find 8485 newly diagnosed cancer cases Diabetes is a chronic disease, of which type 2 diabetes is the most common The study showed that men and women with type 2 diabetes had a 34% and 62% higher risk of cancer than men and women in the normal population In men, the highest risk is prostate cancer, and type 2 diabetes is 86% higher Among women, the highest risk is NPC, and the risk of NPC caused by type 2 diabetes is more than twice as high In addition, type 2 diabetes may also lead to an increased risk of leukemia, thyroid cancer, lymphoma, liver cancer, pancreatic cancer, gastric cancer, lung cancer, breast cancer and other diseases Https://onlinelibrary.wiley.com/doi/abs/10.1111/1753-0407.12926 the new system can monitor the concentration of air pollutants in real time According to the data of the World Health Organization, 90% of the world's people breathe polluted air However, there is no effective solution to evaluate the "contribution rate" of each pollutant emission source (automobile exhaust emission, enterprises, etc.) to the ecological status of urban air medium in real time The "ecological monitoring" project of the Institute of nature and precision science of the National University of South Ural is dedicated to solving this problem and developing a computer software based on mathematical model "We need to know the concentration of each substance in a certain area and whether it is safe to be there," said Dmitry drozin, the project leader If there are several industrial enterprises located in a certain part of the city, the contribution rate of each substance to air pollution, background concentration of pollutants, and contribution rate of automobile exhaust emissions must be considered " Users can see the concentration information of various substances in a monitoring area on the computer screen or other devices in real time The software not only collects the information of pollutant concentration in a certain place, but also predicts the future change of this pollutant In the near future, researchers will show and test the first version of the software Http://digitalpaper.stdaily.com/http_ / 21 / content_ HTM? Div = - 1 scientists write a family tree of bedbugs: every 500000 years, a new bedbug falls in love with human blood bedbugs, not just apple seed size bloodsuckers that make visitors doubt the hotel bed sheets There are about 100 species of bedbugs that plague bats and birds, some of them in caves that humans rarely enter Today, scientists use DNA from more than 30 kinds of bedbugs to create the first bedbug family tree, which is full of surprises - for example, the history of this annoying insect is much older than previously thought, even dating back to the age of dinosaurs Although researchers aren't sure which creature became the first "lucky" to be bitten by bedbugs, they now know that at least three different bedbugs have fallen in love with human blood over time https://