An opinion piece signed by researchers from the Universities of Aberdeen and Nottingham (UK) has outlined some of the inaccuracies, exaggerations and misconceptions they say are taking place around research on the human microbiome. Some of these are curiosities, like the false belief that we have ten bacteria for every human cell. Others are more relevant, such as the fact that many specific associations between the microbiome and disease have not been confirmed in follow-up studies. According to the authors, it is important to raise awareness about myths and misconceptions to avoid unproductive research projects and preserve public confidence in microbiome science. The article is published in the journal Nature Microbiology.

In 64 % of the cases, the temperature thresholds that define a heatwave according to the Ministry of Health are below the heatwave threshold established by AEMET. This implies that the population does not perceive situations of risk to their health when they do exist.

Influenza A can cause influenza in humans, birds, pigs, and other mammals. In 2009 and 2010, a pandemic caused by the pdm09 strain—popularly called 'swine flu' because it contained genetic sequences from avian, swine, and human influenza—caused thousands of human deaths worldwide. Since then, this lineage has crossed over 370 times from humans to pigs in the United States, according to a study published in PLOS Pathogens. The research also indicates that the circulation of the virus among pigs may cause further evolutionary changes in this lineage, which would increase the risk of the virus passing back to humans.

A team of South Korean researchers claims to have achieved a superconductor at room temperature and pressure for the first time in history. If true, it would mean a revolution in physics with implications for the whole of society. The material, called LK-99, is based on a copper-doped lead apatite framework. The article is a preprint and can be read in the ArXiv repository, where the research community shares their work before it is reviewed for publication in a scientific journal.

The Atlantic Meridional Circulation (AMOC), a large system of ocean currents that transports warm water from the tropics to the North Atlantic, could collapse around the year 2050 with serious consequences for the climate, according to estimates by researchers at the University of Copenhagen (Denmark). The IPCC considered a complete collapse unlikely during the 21st century. The results are published in the journal Nature Communications and the authors do not rule out that this collapse may be partial.

An attribution study by World Weather Attribution (WWA) concludes that the heatwaves in Europe and North America this July would have been "almost impossible" without climate change. Over the past few weeks, southern Europe, parts of the United States, Mexico and China have experienced severe heatwaves with temperatures exceeding 45 °C. The WWA report notes that in China the heatwave was at least 50 times more likely due to the climate crisis.

A phase 1 clinical trial has tested the use of psilocybin to treat anorexia nervosa. Ten women with the disorder were given 25 milligrams of the hallucinogen along with psychological support. The results show that the treatment is safe and tolerable. Four patients showed an improvement, but the authors acknowledge that, because of the small sample size and the absence of a control group, "the results are preliminary and further research is needed". The results are published in the journal Nature Medicine.

The European Medicines Agency (EMA) has recommended marketing authorisation in the European Union for Abrysvo vaccine to protect against respiratory syncytial virus (RSV) disease in infants up to six months of age. It is the first vaccine of its kind indicated for passive immunisation of newborns through administration to the mother during pregnancy. It is also indicated for people over 60 years of age. The European Commission now has to decide on its EU-wide marketing authorisation.

A systematic review published in Nature Human Behaviour shows that there is a lack of solid scientific research supporting strategies commonly recommended by the media to increase happiness. The research identifies the five strategies most commonly cited by the press: expressing gratitude, improving sociability, exercising, practising meditation or mindfulness and increasing exposure to nature. According to the study, which analysed the published scientific literature on these practices, their effectiveness in increasing happiness is uncertain, because most of the research lacked sufficient statistical power to detect noticeable benefits or had not been previously recorded - a common practice in psychology today.

According to a statement issued Monday by the World Health Organisation (WHO), Poland has reported that "unusual" cat deaths have been found in several areas of the country. Of the 47 samples tested (46 from cats and one from a caracal, another type of feline), 29 were positive for the avian influenza A(H5N1) virus. The surveillance period for all contacts has now ended and no contacts have shown symptoms. According to WHO, "sporadic A(H5N1) infections of cats have been reported previously, but this is the first report of a large number of infected cats in a large geographical area within a country".