See for months now the coronavirus pandemic has dominated the News Coverage 1000 has spread all over the world and changed our lives but how many people have actually come into contact with the virus and will that be a 2nd wave of infections in those countries where the numbers have gone down for scientists to gauge that properly as many people as possible need to be tested for the virus so what tests are available and how do they work. The standard genetic test involves taking a swab from the back of your throat or alternatively from up your nose. The sample is then checked for the presence of viral d. N. A. Which would indicate an active infection when the virus is still replicating. The tests are highly accurate and can detect infection early. But the downside is that the samples have to be taken to a Specialized Lab for analysis meaning it can take up to 2 days. Get a result. A much faster option is the Antibody Test it involves taking a sample of your blood it only takes a few minutes and theres no lab required but this test doesnt actually detect the virus per se instead it checks whether the bodys immune system has produced antibodies in response to it but that immune reaction only takes place around 7 days after infection so if youre just being infected the test wont detect it Antibody Tests arent suitable for diagnosing active cases but they can be helpful in showing who has already have the virus and may have developed immunity theyre especially useful for finding out how widely the virus has spread in a population. Finally there is the antigen test this method uses antibodies to check for socalled antigen proteins in a sample these are molecules that kick start the bodys immune response. These tests are fast and simple and can detect new infections but because there need to be a lot of virus proteins to stick to the antibodies the accuracy rate is lower than in the standard diagnostic test. The method is commonly employed to test for influenza and hiv an antigen test of covert 19 was introduced in may 2020. More than 600000 people have died of the corona virus so far and more than 15000000 people have been infected worldwide we spoke to thomas come hard from the German Society for immunology and asked him if people who recover from covered 1000 immune to the disease. Millions of people have suffered from court 19 and until very recently there were no reports on. Reemergence of the disease until in a paper was published in the last. Said Infectious Diseases from who han in china where. Hospital workers followed people that had been ill discovered 19 were cured have been released from the hospital and were followed up and out of 600 such people are coalescing people are some where positive again on virus test thats not unexpected but 8 of these where it sick again and some of these needed hospitalization that is to say that a small percentage in the range of one percent of people who have recovered from the disease may be reinfected very soon after they have recovered the cells are an important part of our immune system what role do these helper cells play in coronavirus immunity. We know very little about t. Cells in the defense a good quote good against cope with 19 but we do know that theyre extremely important for other respiratory viruses so we can assume that they are also important for sauce cove too and we know from sars the earlier variant of the sauce go far asus that t. Cells. Are detectable in the mucosal in the respiratory tract a much more long lived and probably more important in the antibody responses in these patients so the t. Cells are extremely important to protect us against respiratory viruses like of 2 to defeat the covert 1000 pandemic we need a vaccine scientists all over the world are working around the clock to meet the challenge as of late july the w. H. O. Says there are 25 vaccine candidates currently in clinical evaluation the Research Teams are pursuing various strategies. More than 160 Research Groups around the world a Company Working on the potential. Knows the early stages. Of research is involved deploying a variety of strategies. Some are working with coronavirus cells that they funded harmless other teams are focusing on individual molecules generally taken from the shell of the virus. Another approach is to take viruses that are harmless to humans and out of her own new virus shell protein. The idea common to all of these methods is for substances to and to the body that will activate the immune system. Which will in time. Is to the back. So if the actual virus infects the body those antibodies are immediately dispatched to its heart and neutralize the invaders. But producing vaccines on a large scale takes time something thats in short supply with the ongoing pandemic. But there is a promising alternative strategy. In this case Scientists Use m. R. N. A. A single strand element of the virus is genetic. The body then builds virus molecules based on my code effectively creating its own vaccine. The virus molecules activate antibody production. A number of. Unknowing Clinical Trials involving humans with several approaching the final stage of testing. Which one of the candidates gains approval for us remains to be seen. All the thing organisms communicate through fragrance animals through noises and behaviors elephants communicated frequencies too low for humans to hear. And manta rays make sounds in the water with the help of the films. But as far as we know only human beings have developed a complete language system so how did we do it. So you. Can track approximately 7000 languages are spoken around the world today there are 24 official languages in the European Union alone and over 100 minority languages on the continent but how did language originate how did it. Thats what the experts at the Leipzig Research Center for Early ChildhoodDevelopment Want to explore using real life specimens discovered. We know relatively little about the roots of the language we use today because we cant travel back in time so we have to rely on finding alternative languages that we can study im sure you can. Sign language for example examining it in depth can provide the researchers with some interesting insights. To be honest this in 3000. 00 cost inflation he called it as a sign language can be understood instinctively. Its pretty clear that we could communicate and express ourselves using sign language quite easily so it was a good starting point for us one thing we wanted to find out for example was even if they cant speak or if they cant use the language they know. What can children intuitively do to communicate with a playmate say pop and beautifullest and. The researchers therefore examine how simple gestures can give rise to a new form of sign language. In the sense this study shows us what components are required for a language to develop be it a spoken language or a sign language. For the study the children were put in different rooms and could communicate via webcam but without sound they could see each other but not talk to each other. Their 1st task was to communicate what was on the pictures in front of them using a hammer for example. When the most common solution the children came up with was to act it out if i want to convey using a hammer then i make a gesture thats what we call an iconic gesture a sign whose form resembles its meaning whats. The 2nd task. It was harder the children had to convey a blank sheet of paper so there was nothing and such to convey the girl on the right isnt getting it but. The other girl isnt sure what to do and tries showing a flat hand. Then all of a sudden the girl on the turquoise shirt has an idea she points to a white spot on her t. Shirt and eventually the penny drops in the sun because whats exciting is what happens next when the 2 girls switch roles even though the other girl doesnt have anything white on her t. Shirt she does the same thing so theyve spontaneously come up with a word a gesture for an abstract concept nothing nothing. The final task was even more complex. The children had to convey for example the difference between a smaller and bigger dog. And seen such as a monkey chasing an elephant. The researchers were surprised by the children solutions. The 3rd showed the children arent limited to thinking up gestures to represent something they can also use these signs to construct a mini grammatical system when they want to convey a more complex meaning. As the scenes they wanted to convey became more complex the children became more inventive in creating and combining science. But what does that have to say about the origins of language. Believe that yes dabbling of science in the form of gestures is a plausible starting point for language but basically the 1st step is to establish a sign that directly represents what it expresses an action say the 1st the signs are established and in the 2nd step combined then you have a set of rules that can be widely used. To like think researchers are still only in the 1st phase of their study a study they hope will lead them back to the. Origins of human language. For more stories from the world of science go to our website or find us on twitter at d w underscore science. And now were off to the coldest part of the earth in antarctica where germany runs a research station called knowing my are 3. Past these webcam pictures suggest scientists working at the research station need to be made of tough stuff but several teams of scientists are up for the challenge seeking answers in the ice we join one group who are investigating the effect of Climate Change on emperor penguins. Setting out from the new minor 3 research station in antarctica the snowmobiles of the german scientists are driving over a sheet of ice thats 200 meters thick. Its the extreme ice shelf which ends a few kilometers further on with the frozen ocean begins. The winter landscape offers nothing but icebergs and emperor penguins. And life in bitterly cold conditions at the tip of the world. Has spent several months observing the penguin colony emperor penguins breed and rear their young on the sea ice. Would you know what a stage when the chicks are relatively big. They can stay on their own for quite a while allowing both parents to go off in search of food. For them so you slowly have the 1st kindergartens forming to come together in groups of them so that they have a bit more protection. This year the penguin researchers have. Drones with them partly because they want to map out the colony but also to test how the birds respond to the noise. We hear on the half of the German Environment Agency and because more and more drones are being used here they want to have a basis on which to draw up guidelines covering when at what height drones can be used above animal populations. In addition to testing the impact of the noise the scientists will also be able to determine for the 1st time how many emperor penguins are actually here in the colony so far their numbers have only been estimated at more than 20000. The 1st trial runs with the drone run smoothly. So it looked like there was less of a reaction than expected. We thought theyd panic more but the response was relatively small as far as we could observe. The emperor penguins come here every year after their feeding season where they fatten themselves up ready to breed. The Scientists Say that if the climate continues to change the future of the emperor penguins will be in severe doubt to do you. Think theres a grave risk for this penguin colony but the structure of the sea ice on which they breed will change. If temperatures increase and the sea ice receives or breaks up earlier in the here their breeding season will be shortened or they may have no breeding ground left at all. And that of course could mean they could no longer build up a colony or reproduce here. Such drastic changes have already become a reality elsewhere Climate Change and rising temperatures on the antarctic peninsula mean some species of penguin are now disappearing chinstrap penguins have been especially hard hit. With population numbers dropping sharply. The declines that weve seen are definitely dramatic now will they continue thats thats the question are there enough krill does the population stabilize. There are plenty of chinstrap penguins in the world theyre not going to go immediately extinct in the next couple of decades. The number of emperor penguins in this colony has remained stable so far because the temperatures in their area which is the southern part of antarctica havent risen so sharply but scientists are keen to study how things could change in the future and are looking for Early Warning signs. They pick up and study the chicks that are frozen to death in the icy winter winds alexander vento from the German University of alabama is part of the worlds most comprehensive long term study on the project due to some of these birds probably die 2 or 3 months ago you can see that from their size it was a. Reason theyve been conserved in the ice ever sense. But its not so unusual for this species that many of the juveniles die early on the conditions are just very harsh here. Nevertheless the colony remained stable. Its almost as if nature had factored in the dead chicks the scientists are looking for penguins that they tagged with g. P. S. Transmitters a few years ago the idea is to see how far individual penguins stray from the colony while hunting using High Resolution cameras for scientists observe the colony throughout the year in winter they huddle together for warmth and scooted from the mouths of the number one goal of each penguin is to lose as Little Energy as possible in the cold antarctic winter when they breed this week so they seek to optimize their position in the colony. And whats so fascinating about these birds is that they manage without any hierarchical structure where one gives the orders to move collectively. In a well organized way its qualities to be but all penguin researchers are worried about Global Warming if the sea ice begins to melt earlier in the season things could look bleak for the penguins but. If we keep to the 1. 00 or 2 degree limit of Global Warming set out in the Paris Agreement then we can save this species if not it will be lost by 2100 at the latest wall its not yet clear how things will turn out but what is clear sooner or later Climate Change will threaten the existence of the emperor penguins. Hollywood has long understood the power of lights and lasers star wars and the battle of good against evil would have been a lot less impressive without the light sabers. Dealing jet i worry is maybe pure fiction but laser tools made of light of very much a reality and a powerful one at that. It is. A beam of light that slices through metal. Laser light has become something of a tool for all kinds of uses. It melts plexiglass cut through thick steel also underwater and can even be used to defuse bombs. At the laser tent home hung over or l v h scientists study these ultra thin high powered beams and develop new applications for them like any light a laser beam can be redirected with mirrors or focused on to a target with lenses but laser light transports a lot more energy. To produce laser light a medium like a gas undergoes energetic excitation. When light particles are fired at the gas molecules they in turn also emit light this leads to a kind of Chain Reaction further amplified by mirrors the result is a high intensity beam of a single wavelength that can be directed with great precision. Lasers are useful for applications requiring a High Energy Density and a high level of precision as in 3 d. Printing. This metal dust will be used to create a small gear unit the computer controlled laser melts the fine steel granule it according to the pattern thats been programmed. With on the republic you have a bed of powder and a slide bar and then each layer is individually coated all melted by the laser and the component is gradually built up layer by layer. I can be very flexible with the design im not restricted to certain geometries thats particularly helpful when designing implants or other components for the human body so its very useful in the field of medical technology i can make objects that you couldnt create in a single step using molding or cutting techniques. That ive got to do. However it takes 14 hours to print the gear mechanism. Never voted the a bird is more interested in the destructive power of lasers she shoots down we its with an invisible laser beam the effect is instantaneous and its deadly. Her invention sounds Like Star Wars for farmers a tractor fitted with cameras 1st against the ground using photo recognition it differentiates between weeds and crops and a ray of laser cannons at the rear them zaps the weeds making them shrivel up and die while they were has already developed the individual components is not an identity so were looking for alternatives to chemical weed kellers the advantage of this system is that its not a blanket effect unlike with chemicals that kill entire classes of plants and because we actually target each individual plant you could even decide you only want to kill the weights that are competing in the immediate vicinity of the crop plant say within a 10 or 15 centimeters radius and you let the rest go on growing it is vital. Unlike in farming lasers have been used for years in the Steel Industry shipyards for example use huge cutting machines with lasers that can slice through thick steel with a High Precision cuts here the highly concentrated focused light is melting through this 2 and a half centimeter thick steel plate. The instrument can cut through thinner sheets of steel even more quickly lasers are not only very precise the power dosage can also be adjusted exactly for this precision set laser can even carve a word into the head of a match without setting it alight and graving without igniting. Pretty cool. And their High Precision and power makes lasers useful for another task diffusing bombs. During the 2nd world war allied forces dropped around 1600000 tons of bombs over germany not all of them detonated today there are still about 100000 unexploded munitions buried under the ground lasers could help to defuse them. The bomb has a chemical did or later so it could explode at any time but the laser is contactless so i can control and automate it. First the laser cuts a groove into the outer shell of the bomb which will allow the case to give way in a controlled fashion. Then it cautiously heats up the explosive material so that it doesnt detonate but burns quickly the result is a small explosion that expels the detonator and splits open the case. The outer shell is rips open without causing any further damage. I mean ritually every Street Corner in german cities could have unexploded ordinance lying on the ground so if i can detonate it safely then i can protect people and for me thats more meaningful than just developing technology. Another laser application recently won a nobel prize here laser light acts like a pair of tweezers scientists all over the world now use the technique to move or fix tiny cells in place under the microscope the green crust marks the focal point of the laser light nearby particles are automatically drawn to it. With a laser itself is an electromagnetic field and its focal point has the most powerful electromagnetic field which attracts all the particles or even cells once they fixated there by this field i can move to hold them there all move them around and be in the best case even lift. In the meantime the 3 d. Printer is done lasering the stainless steel gear unit. It just needs a bit of dusting off and then its ready for action. Laser tools are set to revolutionize many technologies in the coming years this may well be the dawn of a new era. The be. Thats all for this week on tamara today nice that you could join us next time well have more exciting stories from the fields of science and technology until then good bye. To. The before. The books on the subject. Object right in the us i am with the violence trauma amsi fascination. Are they a Formidable Force to call. The bottom line. Coming up long. Greens. Pottery class honeycomb for nothing thats come time only a tiny bit bigger the classic board game has taken any world spy story and is now settling on the island of mine now calmly constance fans are celebrating its 25th anniversary with an extra mansion dillema. In 30 minutes. Been told it is for me. Is for. Beethoven is for. Beethoven it is for her. And beethoven is for. Beethoven is for every modern beethoven 2020 vision of the 50th anniversary here on d w. A new era has begun. The fire behind the feeling of. The fame high element of his suburban home places from. The muck. To the consume forests and entire residential areas. Cut the rising temperatures water shortages land clearance theres no fundamental flammable material. 1600. 00 theres no stopping the fires. Above heavy equipment columns. These are. World going up in smoke. In conflagration the world on fire starts aug 12th on t. W. We have to invite it back in and dance with the baby. This is news and these are our top stories u. S. President donald trump says hell take action as soon as saturday to ban the chinese own video app ticktock u. S. Officials are currently looking into tick tocks potential threat to National Security trumps announcement follows reports that hes also planning to order to take talks on or by dance to sell its u. S. Operations. Kongs leader kerry lamb has postponed some tender septembers lead