The transnational agreement on the International Space Station will last until 2024. In December 2021, the United States expressed its intention to extend the operation of the International Space Station until 2030. Europe, Japan and Canada have all agreed to the plan, but Russia has not. According to Xinhua News Agency, on July 26, 2022, Borisov, the new president of the Russian National Space Corporation, stated in a report submitted to Russian President Putin that Russia will fulfill all its obligations to foreign partners on the International Space Station , but has decided to withdraw from the International Space Station after 2024. At that time, Russia will start to build its own orbital service station, which will become the main priority of Roscosmos in the field of manned spaceflight.
What did the dinosaurs sound like?
If you have watched the “Jurassic Park” series of movies, you must be impressed by the roar of the Tyrannosaurus rex. But it is estimated that no one believes that movies can directly reflect reality, let alone the reality 65 million years ago. The sounds of dinosaurs in the movie are just synthesized and edited sounds of real lions, tigers, and bears. The only animals that can be related to dinosaurs are birds and crocodiles that are still somewhat related, so the sound of dinosaurs cannot be the same as the roar of large mammals. Therefore, scientists can only study existing birds and crocodiles hoping to deduce the sounds of dinosaurs. Scientists speculate that most dinosaurs may not roar with their mouths open, but close their mouths and make sounds like ostriches and crocodiles. The sound, which may be cooing or rumbling, is low and punchy.
Could frequent napping be a sign of high blood pressure or a stroke?
A recent study published in the American Heart Association journal Hypertension found that frequent napping was associated with high blood pressure and an increased risk of stroke. A research team from Xiangya Hospital of Central South University used data from the UK Biobank to explore the relationship between nap habits and the risk of high blood pressure and stroke. The sample bank contains the genetic information, lifestyle and health status of about 500,000 British participants (aged 40-69 years), some of whom have received 4 surveys on the frequency of daytime naps between 2006 and 2019 . From these participants, the scientists excluded those who had a history of stroke or high blood pressure before the study began, and then analyzed the association between the frequency of daytime naps and the first report of stroke or high blood pressure in the data of the remaining approximately 360,000 participants . The average follow-up data of about 11 years showed that people who “often” napped were 12 percent more likely to develop high blood pressure and 24 percent more likely to have a stroke than those who “never” napped. In addition, the results obtained by the Mendelian randomization method also showed that when the frequency of naps increased by one level (such as “never” to “sometimes”, or “sometimes” to “often”), the risk of high blood pressure increased by 40%, And higher nap frequency was associated with a genetic history of hypertension.
Bacteria can clean up plastic pollution in lakes?
European lakes are hotspots threatened by microplastic pollution. When plastic breaks down, it releases simple carbon compounds from additives such as binders and softeners. A recent study in Nature Communications found that bacteria naturally present in European lakes can feed on carbon compounds released by plastics. Scientists mixed plastic bag fragments into water samples from 29 lakes in Europe, shook them to release carbon compounds from the plastic into the water, and measured bacterial growth activity in them. They found that the compounds released by the plastic increased the carbon content of the lake water by 4%, doubled the bacterial growth, and about 50% of the carbon was taken up by the bacteria within 72 hours. Bacteria can break down plastic-derived carbon compounds more easily than natural organic matter such as leaves and aquatic plants. The less natural organic matter in a lake as a food source, the richer the diversity of bacteria and the more plastic pollution it removes. This research may help to better control plastic pollution.
Can cats walk?
In most cases, cats don’t walk along. When cats are exercising, their hands and feet do not swing on the same side. This is because there is a rhythm generator in the spinal cord, and the front and rear limbs will alternately stride regularly, in order to maintain the balance of the center of gravity. When they are in different forms of movement, they will have different paces, including brisk sprinting, accelerated running, and tiptoe running. There are many kinds of cat gaits. When running at full speed, it is called gallop gait, which will completely leave the ground in an instant; when accelerating, it is called diagonal gait, with three feet on the ground and one foot off the ground. ground; when tiptoeing close to prey, it is called stealth gait. None of these three modes will go smoothly. Cat turns generally occur when sending pacing.
Why is the scope higher than the barrel but can hit the target?
If you follow the logic in the game and shoot wherever you aim the sight, it is really difficult to understand the relationship between the scope and the barrel in reality, thinking that the two are parallel. But reality is not a game. When shooting in reality, the so-called aiming and hitting is the point where the line of sight from the human eye to the front sight intersects with the parabola after the bullet is fired. Therefore, the front sight of the optical sight above the barrel needs to be adjusted before long-distance shooting. Adjusting the angle of the aiming baseline will generally be adjusted downward. If the distance is long, the barrel may be raised. But no matter what, the optical sight is adjusted before each shot. To adjust to the correct angle, you need to know the distance to the target. There are many ways to measure range, and the better sights have multiple indicators to help the shooter understand the distance to the target and where the bullet will fall. After obtaining this information, the shooter can adjust the position of the front sight on the optical sight so that the line of sight coincides with the point of impact before the shooter pulls the trigger. This is why there is a distance between the magnification lens and the barrel, but it can aim wherever it is aimed.
