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StudyConfirms Unusual Fossils Came from an Animal Scientistssay they have confirmed that strange-looking fossils from more than 500 millionyears ago are remains of an animal. That would make it one of the earliest known creatures. The fossils are found within rocks. They are round with manylines, and look similar to the markings of a leaf. Thefossils were first described in 1947. They have been found in Australia andRussia. Some are very small; others are over a meter long. Scientists have named the mysterious ancient organism that leftthese fossils behind "Dickinsonia." But what exactly was it? In the past, some scientists suggested it was an animal. Othersbelieved it was a single-celled organism called a protist. Researchers presented evidence that Dickinsonia was an animal ina recent paper. The paper appeared in the publication Science. The most important evidence was that Dickinsonia fossils foundin Russia contained carbon-bearing substances produced byanimals. Experts not connected to the study called that evidence strong.They also said most scientists who had studied the fossils already believedthat Dickinsonia was probably an animal. Douglas Erwin is with the Smithsonian Institution. He said he issure the fossils are from an animal. It is not clear when Dickinsonia lived. Some fossils are about558 million years old, said Jochen Brocks of the Australian National Universityin Canberra. He was one of the researchers involved in the study. Brocks considers Dickinsonia to be "the very oldest animalthat we can be sure about. He added that it is about 2 million years older thananother widely accepted animal fossil. Brocks said scientists do not know much about what Dickinsonialooked like. But he said they do know it was "soft and flexible."
计时2 (271 words) Dickinsoniawas not the first animal on Earth. Analysis of the genetic materialsof living animals suggests that animals first appeared more than 720 millionyears ago. But scientists have never found fossils that old. PowerReturns to Indonesian City but Condition of Thousands UnknownElectricpower stations were operating again and some businesses reopened in theIndonesian city of Palu on Thursday. However, the condition of thousands ofpeople in nearby communities was unknown nearly a week after an earthquakeand tsunami hit the area. A total of 370,000 people live in Palu, on the island ofSulawesi. The city has been the center of aid efforts after a 7.5 magnitude earthquakestruck on September 28. A short time later, large waves covered parts ofSulawesi's west coast. International help in searching for survivors has beenimproving. But damaged roads, landslides and poor communications have cut offsome areas from the rest of Indonesia. This has left many survivors in need ofaid that has only just begun to arrive. By Thursday, the number of people killed was officially listedat 1,424, but it is expected to rise. In Palu itself, most of the dead havebeen counted. But Indonesian officials are just beginning to count victims fromrural areas. "There are so many challenges withthis disaster. It's never been so bad," said Frida Sinta, an aidvolunteer.
Palu is about 1,500 kilometers northeast of Jakarta. Parts ofthe city were close to anarchy earlier this week, with people taking thingsfrom stores. But some businesses and banks have now reopened and a mobile phoneservice is working again.
计时3(294 words) Orderlylines formed at fuel stations after the arrival of fuel late Thursday. Trafficlights and televisions came back to life as the power came back on. The improvements are helping with the aid effort. "We carry whatever we can by car or motorbike within thecity wherever we can. But not yet to the most inaccessible places,"Frida Sinta said. About1.4 million people live in the badly affected areas of the disaster zone.Rescue workers are pushing into nearby communities, where people said they havebeen searching for food. A Red Cross helicopter landed near the town of Donggala,northwest of Palu, to bring in bread and other food, a Reuters photographersaid. The news agency worker added that survivors quickly took everything. An Indonesian government spokesman told reporters the main roadsto the south, west and east of Palu had been opened. But there has been little information about conditions on theroad to the north, along the coast towards the epicenter ofthe earthquake. Abdul Haris of the national search and rescue agency said therewas no information about the small settlements along the north road. While the power is back in Palu, it will take much longer forpeoples' lives to return to normal. Asril Abdul Hamid, a business owner, was looking at the wreckageof his home. It was destroyed by water. He found a few family pictures. "(My) family is safe, thank God, but my cousin waskilled," he told Reuters. He said that his family had got food and waterin the past few days.
In 2004, an earthquake off the island of Sumatra caused atsunami across the Indian Ocean that killed 226,000 people in 13 countries. InIndonesia, more than 120,000 people were killed.
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ScientistsCreate ‘Social Network’ of Brains to Share ThoughtsTherehave been many books written and movies made describing the ability of peopleto communicate through thoughts. While this idea has not been demonstrated in reality, physicistsand neuroscientists have reported some progress in recent years. Now, scientists say they successfully connected the brains ofthree people who were able to send thoughts to each other. A group ofresearchers reported their new findings in ascientific paper posted on the internet. The scientists – from the University of Washington and CarnegieMellon University - say they believe their experiment is the very first of itskind. The team used electronic tools to complete the test of brain-to-braincommunication. It wasnot the first time this same group of researchers connected different humanbrains, MIT Technology Review reports. In 2015, they used similar equipmentto link up the brains of two people. Part of that experiment involved the twotest subjects playing a simple word game, the publication said. The group calls its new project BrainNet. It described thesystem as the first "direct brain-to-brain interface"designed to help people cooperate in problem solving. In the experiment, the scientists said only brain-to-braincommunication was used as the three individuals played a video game together.The game was a simplified version of the video game Tetris, which became hugelypopular in the 1980s. In the game, players try to match colored blocks fallingonto a puzzle.
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How it works Two kinds of electronic devices were worn by people taking partin the experiment. Electroencephalograms, or EEGs were used to recordelectrical brain activity of subjects. The other, called transcranial magneticstimulation, or TMS, is a process that magnetically stimulates apart of the brain. This was used to send information to others involved in theexperiment. During the game, two players were chosen as "senders"and a third as a "receiver." The senders had brain signals "decoded"using real-time EEG information. The decoding process recorded each sender'sdecisions about suggested moves in the game. The sending and receiving ofinformation was carried out by the subjects looking at different forms oflight. The decisions were then transmitted throughthe internet to the brain of the receiver, who could not see the video game.The receiver then uses the information from the senders to decide on what gamemoves to make. An additional part of the game provided a second chance forsenders to examine the receiver's decision and send feedback to the receiver'sbrain. Theresearchers said experiments were carried out with five different groups, eachwith three human subjects. They reported all the groups were able to useBrainNet to perform the game moves with a success rate of 81 percent. The scientists added noise to one sender's signal to testwhether that would affect the receiver's responses. They reported that thereceivers learned to recognize the most reliable sendersby using only the information transmitted to their brains. The researchers wrote that the results "raise the possibility offuture brain-to-brain interfaces that enable cooperative problem solving byhumans using a ‘social network' of connected brains."
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