The winter in S City in the south is like the spring in the north: blue sky, white clouds, warm wind, green trees, flowers… 　　”Pick up the baby, grandma?” An old lady who spoke from the back of her nose with her tongue up asked Grandma Hu. 　　Grandma Hu was sitting on the steps next to the gate of the Red Star School, waiting for her grandson to finish school. She looked at the person who called her “grandma”. She was stunned for a moment, and then her eyes widened in surprise. The old lady was full of white hair, bared her front teeth, and shredded meat residue was embedded…

　　The sunset glow turned bright red against the milky white clouds, which was very beautiful. 　　After dinner, “Li Dabei” got dressed and walked to the full-length mirror to start self-appreciation: fashionable dress, well-proportioned figure. Not to mention, he’s in his 60s, and he doesn’t even have a wrinkle on his face. He’s really pretty. 　　In fact, “Li Dabei” is called Li Dahua. She has loved to dress up since she was young. In addition to her tall stature, she is nicknamed “Li Dabei”. 　　It has been more than five years since his wife passed away, and “Li Damei” has been living in her daughter’s house. People say that the daughter…

　　It was obviously winter, but Xiao Yu, who was standing on the starting platform, saw a bird. 　　It was a fiery red bird, rolling down in the snow for some reason. Xiao Yu looked at it from a distance, the bird slowly stood up in the dazzling white snow, shook off the white snow on her body, and fluttered her wings – 　　that smear of red just soared into the sky. 　　Xiao Yu looked down at the clothes on her body, which reflected bright red in the sun, and the flag inlaid with five red stars in the distance was particularly conspicuous in the crowd. Xiao Yu smiled, stepped on…

　　Aperture, that is, a radio receiving device. In classical radio science, aperture refers to the effective receiving area of ​​a radio receiving system, which is used to characterize its ability to receive radio waves. In the “quantum apertures” program proposed by the US Defense Advanced Research Projects Agency, aperture is used to refer to a radio receiving device, and this use is continued in this article. Apertures have been widely used in wireless communication, remote sensing, and detection systems such as mobile phones, radars, and radio telescopes, and are one of the indispensable tools for human survival and development. Since the German physicist HR Hertz completed a series of experiments…

　　For thousands of years, human beings have witnessed the stars, explored the sun and the moon, and have been asking about the origin of the universe and life. 　　Attracted by the magnificence of the starry sky, photographer Wang Haiyan constantly explores astrophotography, chasing the moon and the sun in the severe cold and heat, and recording the deep space at the observatory he built… just to show the romance of the universe to the world. On the left page, the night view of Yinshan Lake in Suzhou, after nightfall, photographers often observe the stars here. The upper image on the right page shows the total lunar eclipse on December 10,…

　　If someone gets lost in the wilderness, he has two choices: one is that he can search for traces of civilization; the other is to start a fire, or write “SOS” in huge letters on the ground to make it easy for others found him. To scientists interested in the question of whether there are intelligent aliens, it seems we can do the same. 　　For more than 70 years, astronomers in the Search for Extraterrestrial Intelligence (SETI) program have been scanning for radio or light signals from other civilizations. Many scientists are convinced that there are more than 300 million potentially habitable planets in the Milky Way, many of which…

　　High temperature, heavy rain, cold wave, storm… After the earth entered the “Era of Escape”, the surface of the earth is no longer a beautiful home for human beings. In order to survive, 3.5 billion people have entered the underground city. People extract oxygen from the soil, use simulated natural light to grow crops, and reproduce the blue sky and white clouds through the holographic screen – this is the scene of people living underground in “The Wandering Earth”. In fact, not only “The Wandering Earth”, but also in sci-fi works such as “Three-Body Problem” and “Gloomy City”, the underground has become the future home of mankind. After reading these…

　　Even if there is no external light source to stimulate, when we close our eyes, we will see flickering lights, this phenomenon is called “phosphenes”, commonly known as “intraocular flashes”. Almost everyone has had this experience, which is the instantaneous light sensation generated by mechanical stimulation, electrical stimulation, etc. in the retina. In our eyeballs, retinal ganglion cells are responsible for receiving visual information from photoreceptor cells in the retina and transmitting it to the brain. Retinal ganglion cells cannot distinguish between stimuli, and rubbing the eye can “trick” them into “wake up” in a light-activated-like manner, sending the stimulus to the cerebral cortex. In addition, phosphenes can also occur…

Qi Zhi returned to Han Village at dusk. There is nothing special about Han Village, except that the village is bigger and has more trees than other villages. Han Village is located in the arms of a big river, so the woods surround Han Village like a belt. Qi Tianxiao, who has been on a plane, said that he can see the real thing in the sky. Water, trees, and villages all look real. Someone asked, can you see Longcun from the plane? Long Village is as big as Han Village. Qi Tianxiao said disdainfully, Long Village is nothing, there is not a single tree. A levee is dozens of…

　　Music occupies a pivotal position in almost all religions in the world. In Europe, Christianity, as a special ideological and cultural phenomenon and a humanistic care system, has a long-term dominance over social ideology. Therefore, the accompanying Christian music has become an important means for European society to spread spiritual beliefs. In the Christian conception, music is a blessing from God and a gift from God to mankind. Many musicians believe in Christ and express their devout and sacred religious feelings through the creation of music genres such as Masses, Passions, Oratorio, Cantata, etc., leaving an immortal musical chapter for later generations. However, due to the differences in the historical…

　　 Since the beginning of summer, there have been many cases of heat stroke patients. Heat stroke is commonly referred to as severe heat stroke. Heat stroke is divided into exertional heat stroke and non-exertional heat stroke. Exertional heat stroke is caused by high-intensity physical exercise in a high-temperature, high-humidity environment and no wind, resulting in a rapid increase in the core temperature of the body, exceeding 40 degrees Celsius. , An extremely serious clinical syndrome with multi-organ and multi-system damage such as disturbance of consciousness, rhabdomyolysis, disseminated intravascular coagulation, acute liver damage, and acute kidney damage. Exertional heat stroke is the most serious type of heat stroke, which is…