中山哪里混合痔手术好(中山生痔疮怎么办) (今日更新中)

Neanderthals may not have been that different from us, after all.New evidence reveals that they created the world's oldest known cave paintings and even wore seashells as body ornaments. Both behaviors suggest that they thought symbolically and had an artistic sensibility like modern humans. Two studies published Thursday in the journal Science detail the latest findings."Undoubtedly it is showing that Neanderthals were thinking and behaving just like modern humans," Alistair Pike, co-author of the studies and professor of archaeological sciences at the University of Southampton, wrote in an email."We should no longer think of them as a different species, just humans in different places," he said.The new findings of symbolic thinking show that Neanderthals and modern humans were cognitively indistinguishable, the researchers said.Cave paintings and artifacts like painted seashells have long been regarded as the work of early modern humans, who were thought to have more advanced cognitive abilities than Neanderthals. Dating cave paintings can be a difficult process, and unreliable techniques never allowed for the possibility that these could be the work of Neanderthals.Until now, that is. A new technique called Uranium-Thorium dating is less destructive, is more accurate and can go back further in time than other methods. U-Th dating looks at the deposits of carbonate on top of the paint, which contain traces of uranium and thorium that indicate when those deposits formed. That allows the researchers to determine an age for what's under the deposits.The researchers applied this technique to paintings in the La Pasiega, Maltravieso and Ardales caves in Spain, which had never received "robust" dating. The paintings include red and black images of animals, dots, lines, disks and other geometric signs. There also are engravings, hand prints and hand stencils.Those hand stencils are particularly significant, and not just because they represent the hand size of a Neanderthal."A red line, a red dot or even a positive hand print could potentially be made 'accidentally,' " wrote Dirk Hoffmann, lead author of the studies and archaeologist with the Max Planck Institute for Evolutionary Anthropology, in an email."Of course, I am sure that this is not the case, since you would still need to bring [in] light and pigment, but one could argue that all you need is some pigment on your hand when you lean against a wall. A hand stencil cannot be explained like that. You have to hold your hand against the wall and the deliberately spray pigment over this. This is why we emphasize the hand stencil."The dating revealed that the cave art was created more than 64,000 years ago -- 20,000 years before modern humans appeared in what is now considered Europe.The shells were found in the Cueva de los Aviones, a sea cave in southeastern Spain. They are unique because they are perforated with holes and colored with red and yellow pigment. Others served as containers for the mineral pigments themselves. The pigments were used on the shells but could have also been used for the cave paintings and even as body paint.The deposit layer containing the shells dated to 115,000 years ago, which is even older than other shells recovered in Africa that were dated to modern humans."The standard archaeological interpretation of such finds is that they are body ornaments," Hoffmann said. "Similar finds were made in Africa or the Levant with similar age. In Africa or the Levant, these were made by modern humans, in Spain Neanderthals made them. So in terms of symbolism, early modern humans and Neanderthals were similar."The researchers are absolutely confident in their dating technique."We have spent 10 years refining the technique and have numerous quality controls," Pike said. "The dates respect the growth axis of the deposits we are dating, the oldest closest to the painting, the youngest at the surface."Once modern humans left Africa and migrated to Europe and other areas, mixing with the Neanderthals would've been inevitable. The researchers believe that the Neanderthals created this artwork on their own, without being influenced by any other population. But it's possible that they exchanged symbolism or that Neanderthals influenced the art and symbolism of modern humans. Modern humans were capable of symbolic behavior, so it "turns the who's copying who debate on its head," Pike said."The idea that culture only evolved with modern humans no longer makes sense," Pike said. Hoffmann suggested that Neanderthals now be referred to as "very close cousins" of modern humans.Is it possible that anyone else may have created the cave paintings?Pike said it is incredibly doubtful that a population of early modern humans migrated to Europe so early without any other evidence to suggest it."We cannot of course rule out that pre-Neanderthal populations made the art," Pike said. "This sounds like a project for the future."Hoffmann, Pike and their colleagues want to use their new dating technique in more caves in Spain, as well as France and Italy -- and anywhere else Neanderthals are known to lived.The findings also raise new questions for researchers."How far back does symbolic behavior go? Can it be traced to the last common ancestor of modern humans and Neanderthals? This is perhaps where we should be looking," Pike said. 5398

Mira Ricardel barely lasted seven months as deputy national security adviser before First Lady Melania Trump issued an unprecedented call for her dismissal and President Donald Trump moved to fire her.In those few months on the job, Ricardel generated a long list of enemies and developed a reputation for shouting at subordinates, plotting against White House officials she disliked and leaking stories about her administration opponents to the press. One source familiar with the situation said Ricardel's firing is due in part to her "bullying" of aides both above and below her.Current and former colleagues of Ricardel paint a picture of a committed conservative and national security expert with a strong personality. One former colleague described her as someone who doesn't "suffer fools" or have a nuanced touch when it comes to navigating the shoals of internal politics. A White House official was blunter, describing the California native as ideologically driven and "obstinate".The former State Department and Pentagon official made enemies of heavyweights within the Trump administration, feuding with chief of staff John Kelly, his deputy Zach Fuentes, and locked horns with Defense Secretary James Mattis, according to people familiar with the White House intrigue.But her spat with the first lady's staff over Mrs. Trump's trip to Africa -- apparently over seating on the plane and the use of National Security Council resources -- seems to have earned her the enmity of the person who may wield the most weight with Trump: his wife.The President told people on Tuesday that he had made the decision to fire Ricardel, but that he was giving her time to clear her desk, making her the latest in a long list of high ranking officials who have left or been booted from the Trump administration.Ricardel did not return requests for comment.Ricardel was raised in Pasadena, the child of a Croatian immigrant and went on to study at Georgetown University's School of Foreign Service and then do doctoral work at Tufts University's Fletcher School of Law and Diplomacy. 2097

Nearly 2,000 people were confirmed to have died of complications from COVID-19 on Wednesday, according to a database kept by Johns Hopkins University. That's the most number of recorded deaths in a single day since early May.According to Johns Hopkins, there were 1,848 COVID-19 deaths recorded on Wednesday, the most deaths recorded in a single day since May 7, when 1,925 deaths were recorded. At that point in the pandemic, deaths linked to the virus were finally beginning to tick down after a wave of silent and uncontrolled spread in March and April.According to the COVID Tracking Project, the U.S. has been averaging about 1,200 deaths per day for the last week — a figure that has continued to rise since late October. The uptick in deaths per day has surpassed a spike in the summer months when the virus began to spread in some southern and western states. The COVID Tracking Project also reports that hospitalizations linked to the virus continued to be at their highest point at any point during the pandemic. The group reports that on Wednesday, more than 79,000 people across the country were in the hospital with the virus. The group also reports that 71% of hospitalizations across the country have occurred in the Midwest and South. Many rural hospitals in those regions are currently overwhelmed or at capacity. COVID-19 continues to spread at a frightening pace throughout the country. On Wednesday, more than 170,00 people were diagnosed with the virus, the second-most number of cases recorded in a single day. The record came last Friday when more than 177,000 cases were reported.In the month of November alone, more than 2.4 million Americans are confirmed to have contracted the virus.Throughout the pandemic, 11.5 million people in the U.S. have contracted COVID-19 and more than 250,000 have died — the most of any country throughout the world. 1889

NATIONAL CITY, Calif. (KGTV) - One person was shot near a convenience store in National City Tuesday.The shooting happened about 11 a.m. near the 7-Eleven at 151 N. Highland Ave. near Eta.A clerk at the store confirmed the parking lot was blocked off by police. She said she did not see any violence or hear any shots fired.10News is monitoring breaking developments. 375

Most children starting school this fall find themselves in the same place they ended in the spring – at home. These kids and their parents are having to make the effort to find a routine that works.Mother Kim Alvidrez says she has her twin 6-year-olds treat school from home the same way they would if they were heading to class. That includes having breakfast and breaks at the same time.She sees frustration in her kids for not having one-on-one teacher help and not being around other students.“It’s hard, as a mom to watch your kids. They want it. They want to be there, and they want to be involved but they can’t fully participate,” said Alvidrez. “It’s just their presence that’s counted. And that’s their time. That’s my biggest concern. “Alvidrez says her kids are kept silent during Zoom lessons and are encouraged to not ask questions. If questions are asked, she says it’s limited to one or two.Child psychologists say parents need to work through those struggles and remain positive to help create a better learning environment.“The number one way kids learn is by watching what their parents do,” said Dr. Jessica Hawks, a child psychologist at Children's Hospital Colorado. “So, if a parent can present an optimistic and positive about the fact that their child's in online schooling, the child's more likely to embrace that philosophy and mentality and can really be helpful overall to the engagement.”Hawks says parents also need positive routines for kids, which include proper eating and sleep habits, along with a designated area for kids to do their online work.As for Alvidrez, she says one positive is her twins are in the same class. 1665

来源：资阳报