Recent scientific research has conducted an in-depth analysis of the changes in summer temperatures over the past two thousand years. The study focused primarily on regions outside the tropical zone in the Northern Hemisphere, within latitudes ranging between 30 and 90 degrees, including areas like Europe. By combining observational data and reconstructions based on proxy indicators, the research team delved into analyzing the variations in surface temperature from June to August.

Using measurement data from thousands of meteorological stations, researchers found that the average temperature in the region during the summer of 2023 was 2.07 degrees Celsius higher than the average measured with instruments from 1850 to 1900. To trace longer-term temperature trends, the research team further employed a clustered reconstruction method for summer temperatures outside the Northern Hemisphere's tropics and integrated nine of the longest-standing and temperature-sensitive tree-ring dendrochronology datasets. They found that the summer of 2023 was 2.20 degrees Celsius hotter than the average temperature from the year 1 to 1890, which were not recorded. Compared to the coldest summer during that period (in the year 536, affected by a volcanic eruption), the temperature in the summer of 2023 was even 3.93 degrees Celsius higher.

Although this study's warm phenomenon cannot be universally applied to the entire globe, researchers still emphasize that these estimates reflect that the current global warming condition is unprecedented and require us to urgently take actions, reducing carbon emissions to mitigate the impacts of climate change.

In the field of sleep science, a new study conducted by Imperial College London presents a novel perspective on the impact of sleep on health. It has always been believed that good sleep helps the brain regain vitality as the cerebrospinal fluid is able to effectively wash away waste in the brain during sleep. However, this study, published in the journal Nature Neuroscience, shows that the brain's ability to clear waste in mice actually decreases during sleep or anesthesia.

The research team used a fluorescent dye to track the speed of fluid flow from mouse brain ventricles to other brain areas, thereby assessing the brain's waste clearance capabilities. The results showed that the rate of brain waste clearance in mice during sleep decreased by 30%, and by 50% under anesthesia. This indicates that the brain's waste clearance efficiency is higher when awake, suggesting that staying awake, remaining mentally active, and regular physical exercise might be a more effective way to clear toxins from the brain.

In the latest astronomical discoveries, Dr. Xu Jun and Researcher Han Jinlin from the National Astronomical Observatories of the Chinese Academy of Sciences, through analyzing the data distribution of Faraday rotation effects of pulsars in the Milky Way and peripheral radio sources, revealed a gigantic magnetic ring structure in the halo of the Milky Way. This major discovery has invaluable scientific importance for the study of cosmic ray particle propagation, galaxy gas dynamics, and the evolution of cosmic magnetic fields. These observations have been successfully published in the prestigious academic journal Astrophysical Journal.

There has always been a challenge in measuring the size and strength of the Great Magnetic Ring of the galactic halo, especially because the pulsars and other celestial bodies in the murky region near the Sun also show symmetrical distributions of the Faraday rotation effect, which confuses measurements. By extracting the Faraday rotation effects of nearby pulsars as local interstellar medium influence, the research team was able to clearly distinguish the galactic halo's Faraday rotation effect in the sky distribution of extragalactic radio sources, thereby establishing its existence.