From 2011 to 2019, improvements in life expectancy slowed down in many European countries and many experienced declines in this indicator during the Covid-19 pandemic (2019-2021), according to a study published in The Lancet Public Health. The research shows that the average annual improvement in life expectancy fell from 0.23 years (1990-2011) to 0.15 years (2011-2019) in 20 European countries, including Spain.

A team of US researchers has followed some patients treated with CAR-T therapies in a small clinical trial conducted between 2004 and 2009 to treat children with neuroblastoma, a nerve cell tumor that can have a poor prognosis. At least one of them, a woman who was treated with CAR-T as a child, remains in remission 18 years later, the longest duration of such therapy described to date. The results are published in the journal Nature Medicine. 

A team of researchers from the University of California (USA) has analyzed the presence of hate speech on the social network X (formerly Twitter) since its purchase by Elon Musk in October 2022 until June 2023. Their findings are that this type of racist, homophobic and transphobic speech increased by approximately 50 % throughout this period. In addition, the presence of bots and fake accounts did not decrease, contrary to Musk's own promises. The results are published in the journal Plos One. 

An international team of scientists from the KM3NeT collaboration has detected the signal from the highest-energy cosmic neutrino to date, some 30 times higher than those previously detected. The result suggests that the particle came from beyond the Milky Way, although its precise origin has yet to be determined. The results are published in the journal Nature. 

‘Bacterial signatures’ from genital areas could serve as a forensic tool to identify perpetrators of sexual assault, even if there is no trace of sperm, according to a study published in the journal iScience, by the Cell group. After sequencing the DNA of bacteria from genital samples from 12 stable couples, the authors show that a transfer of bacterial species occurs during intercourse, allowing the identification of each person’s own genital microbiome or ‘sexome’.

A study in 2024 described how the Earth's core had slowed down its rotation speed in recent decades. Now, the same international team of scientists adds that its shape has also changed over the last two decades. Until now, it was thought that both processes could not occur simultaneously. According to the researchers, who publish the results in the journal Nature Geoscience, the finding could improve our knowledge of the core's properties and structure.

Two papers published in Nature Climate Change analyse the possibility of exceeding the Paris Agreement targets of limiting warming to 1.5°C above pre-industrial temperatures. Both papers suggest that having exceeded this warming threshold by 2024 could indicate that we have entered a period of several decades with average global warming of 1.5 °C. According to the authors, rigorous climate mitigation efforts are needed to keep the Paris Agreement targets within reach.

Toddlers' screen time has a negative correlation with their language skills, according to a study published in PLoS ONE. However, the use of educational content and screen time in the company of adults show a positive association with language skills. The study included nearly 1,900 children between one and four years old from 19 Latin American countries.

Thousands of people congregate at the San Fermín festival in Pamplona. By analysing camera images from the Plaza Consistorial during the chupinazo in four editions, a team has modelled what the movement of this human tide looks like. The physical theory of dense crowds can be applied in other circumstances, say the authors, who include scientists from the University of Navarra. In their paper published in Nature, they offer a strategy to anticipate these movements in real time and help prevent events such as avalanches.

A paper published in The Lancet Respiratory Medicine has analyzed new cases of lung cancer worldwide during the year 2022. While the incidence in women continues to approach that of men, the decrease in tobacco consumption in many countries causes the proportion of cases in non-smokers to increase. This increase is associated with air pollution, especially in countries such as China.