Welcome to tomorrow today the science show on d w. Is this really ice it is under polarized light ice shimmers in a rainbow of colors. And this is where it comes from the arctic whether sea ice has been declining for decades. And International Research group spent a year studying it to get a better understanding of Climate Change and its impact. Think. Well take winter is a black void in 2 senses 1st its dark thanks to months of nights in which the sun no longer rises over the horizon plus theres a huge data hole we know precious little about when tearing the area around the north pole which plays a major role from kline. Meant and is itself changing the ice has been receding for decades now what explains this Climate Change sure but how exactly does that affect this northern most part of the planet because if so how is the sea ice changing how does it grow in the winter and how does it melt in the summer. Christine has is a sea ice geophysicist at the institute in gemini he sees the arctic winter as the key factor. That the ice forms in the winter and indoors through the summer. It has a considerable influence on the summer and therefore on the entire climate system 1st. But to really study the arctic during winter you need to be at one with the ice an International Research team made that very commitment since last october the polish down Research Ship has been drifting across the arctic ocean trapped in the pack ice. Its the center of the largest Arctic Research expedition ever lasting one full year. When its colder than mine is 30 or even down to minus 60 with the wind chill factor its a very hard to work and also very dangerous you have to cover up your entire body. Most christian has and his team use the winter months to investigate the sea ice on a quest for answers to the big question why is it shrinking. Their work involved extracting ice cores measuring the temperature and movement of the ice and cutting samples into thin slices their mission as such is not one of discovery but a data gathering to compile a detailed biography of the ice but they have made one major discovery during a dive by the trusty robot submarine. A photo of what it was something id been hoping and searching for. What i didnt know was what it would actually look like. Just below the ice in the sea water the robot came across glistening cloud like masses comprised of ultra thin banks of ice known as plate. Inspection plate laid ice is very macroscopic you can see it there are sheets of thin ice as big as your hand. They get stuck frozen onto the underside of sea ice and in various orientations. As the robot submarine swims around in the dark its lamps reveal all these things glittering in the distance. So as they get closer you can see that there are ice crystals. Its a phenomenon already familiar from antarctica and one that the researches have now been able to observe for the 1st time in the arctic. Platelet ice can only form when the sea water beneath the ice has a temperature colder than 0 degrees celsius this super cooling leads to the water freezing and forming plate tectonics seen on the ropes and gauges that the research is low into the countless cavities or cause emerge between the plate lets to create whats called the poorest layer. Its a habitat not just for microorganisms and algae but also. As a kind of tiny christe ations such as krill coppa pods and amphipods we saw ample pods moving around the plate laid eyes looking for algae to eat and they are also protected there from bigger animals from fish in particular arctic cod that would happily eat them as with all of these you know. A newly discovered layer of arctic ice and one more that needs more in depth. Analysis while the expedition across the arctic ocean continues kristin haas is now back on land together with untold terabytes of data now waiting to be deciphered but his team do have at least preliminary insights into the big question of how the ice in the arctic is changing but. It was very interesting to see that when we came onto the ice flow in october with the ice was only 30 to 50 centimeters thick and. We dont over the course of the winter over the following 5 or 6 months it grew to almost 2 meters in thickness that is it almost quadrupled thats a very important discovery. Until now researches knew only that the surface of the ice has been shrinking as seen by satellite suspiciously well during the summer over the last 4 decades that surface is almost hol ft in size. Satellites cannot measure however is the thickness of the ice. What weve now seen is that at the start of the season at the end of the summer. The ice was much thinner than it had been 30 years ago the last time we measured ice in the syberia in arctic. What surprised us is how thick the ice became and. By the end of winter it was not much different from the way it had been back then. As we have established that changes are greatest during the summer not only in terms of the extent of the ice but also to its fitness and that the ice recovers relatively well in winter. And then the fact that the ice is so since by the end of the summer actually helps to ensure that it recovers significantly in thickness during the winter i just dont know as for adults when the ice is thin the ocean loses heat faster and more easily and that leads to the creation of more ice. As a consequence by the end of the. Enter the ice is again about as thick as it was 30 years ago. But theres alarming news 2 new surveys predict that the arctic ocean is likely to see ice free some a spike 2050. At the alfred vega institutes ice core lab in him a half and the temperature is held at a steady minus 25 degrees celsius the facility is home to various some poles from the arctic expedition such as these thin slices of ice cores which turned into crystals and depolarize light. And resulted in. These thin slices of ice cores to see how the ice had grown whether the growth process was slow and under calm conditions which would create these long colomba crystals. Or if there had been strong waves and turbulence in the water. System then only these small round grainy crystals develop because times are good for this you know hamas expects the outtake ocean to become more turbulent making it impossible for a long column shaped ice crystals to form properly that will bring changes to the arctic ocean granular ice could then become more prevalent another insight into the workings of the arctic. The tiny crystals remind us that large structures are made up of small parts from the earth or the universe on the one hand and 2 atoms on the other everything is important and has a role to play a tiny and fascinating well thats a crucial element in the still mighty pack ice that covers the arctic. The problem is red white. And do you have a science question youve always wanted answered were happy to help out send it in and if we answer it on the show youll get a little surprise as a thank you come on just awesome. For more stories from the world of science go to our website or find us on twitter and d w underscore science. Money some that wants to know want on genes. Genes are found in most of the cells in our body. A gene is made up of d. N. A. Found in structures called chromosomes in the cell nucleus. One important thing genes do is provide instructions for building up all the various parts of our body. Genes also underlie our body processes and to a large degree they determine what we look like. Human genome that is the entire set of our genes has been sequenced. We have more than 20000 protein coding genes. A lot of research is going into finding out what our genes actually do. For example are there specific ones that determine how long we live. A helper in that particular quest is the naked mole rat this remarkable rodent is long lived and remains fit and healthy into old age its genome is well understood. As to us one field of research is the role of genes in our ability to taste things and to find something yummy and others nasty. It turns out thats not just a cultural matter but also a genetic one. A technology called crisper genes it modifies the cells genome by removing or adding bits of d. N. A. This enables it to turn genes on or off in plants and in animals including humans. Society will have to think hard about the implications of sciences growing ability to engineer our genes. And. Hearing voices. Visual hallucinations. Delusions. Its a mental disorder associated with changes in perception thoughts mood and behavior it can be hereditary so what genes are associated with the disease. The psychiatric clinic at berlins university hospital. A study here involves healthy test subjects providing saliva samples containing their genetic material and stoop a sions who suffer from schizophrenia. Geneticists. Is looking for genes that may play a role in the disease. Minor presume which of my personal hope is to shed light on to the darkness of psychiatric. Knowledge so to speak. To. People who suffer from schizophrenia may hear voices and be paranoid. Its unclear whats really happening inside their brains which is why Treatment Options have hardly changed in decades. But schizophrenia is known to be highly heritable a factor that geneticists now want to unravel. Theyre conducting large scale Genome Wide Association studies with tens of thousands of test subjects including those in berlin. Each individuals genetic material is examined for components that may be different for each person called single nucleotide polymorphisms or snips. To schizophrenia patients snips are then compared with those of all the healthy test subjects using statistical calculations. Certain snips are clearly more common among schizo phrenic looking at the genetic makeup in its entirety the especially common snips stand out like skyscrapers. A comparison of 35000 schizo phrenic swith 47000 healthy subjects revealed 108. With the disease. The researchers call the confusingly complex genetic landscape a manhattan plant due to its resemblance to new yorks famous skyline. The snips identified the prominent skyscrapers constitute a vital clue they point the way to the genes that may play a role in schizophrenia. And is also what we were a little bit afraid of that its not just one gene that makes the person im sick of these guns feel for sheen its really many different genes that when combined. And create a persons individual risk. And there are hundreds the researchers analyzed every single gene theyve just discovered genes that influence the transmission of signals within the brain stefan presents the results at the european schizophrenia congress in berlin. I also want to show some other regions. Among the hundreds of genes is one that is affected by the medicines currently being used its gets a for any a treatment a match that has researchers hoping for other positive results were decided tones as so these shows us that one central gene can be enough to immensely improve treatment for us but because its just a question of finding it. Very. Close to its like taking a step on the moon but its still a long way off because we know that developing medicines takes decades its. A mammoth undertaking which is why hundreds of researchers have teamed up via the Psychiatric Genomics Consortium including stefan. With the help of large scale genomic study theyre also researching other psychiatric disorders. Many of which now have a manhattan like the one for schizophrenia they provide a guide towards the relevant. But entirely different fields of application are also hidden within the genetic landscapes. The most hotly debated is the potential for polio. For instance or to predict the risk of disease. Does that mean a persons genetic material could be a predictor. Each individual material be examined for d. N. A. Sequence variations associated with the disease the number. Can be used to calculate a personal. In some cases an individuals risk of succumbing to the disease can already be estimated but do people want to know that they have a 7 percent chance of contracting it at some point. Pandoras box with. Disease that develop. Would have enormous consequences for the person themselves of course. Family. Says legal issues it raises insurance issues. Apart from that putting the likelihood of developing the disease into numbers is restricted to the genetic element only. Person limbs and what happens in their life cannot be predicted. Environmental factors play a role sometimes a major one in the development of psychiatric illness. Experts agree pollin genic risks wars are not suited to predicting risk or aiding in diagnosis but they can be useful. To say that it already does have a very large influence is in research. Stefan because team divides the test subjects into groups according to the subjects polly janick scores and then they observe how the group with the especially high schizophrenia scores develops the researchers are a long way off from totally understanding the complex genetics of psychiatric diseases but they are making progress. Why. In a moment well be taking a look at me well us but even as were pretty impressive small but mighty well not all that we can reach out like that 135 centimeters and why up to 36 kilos. Last hour ferguson usually think you have up to 600. 00 hairs per square centimeter of skin we have up to 23000. 00 to top that. Chafe other stuff of legends. We use them to build gigantic structures like this a dam 850 meters long so big its visible from outer space no wonder you call is busy. We might be rodents but were also ecosystem engineers geniuses though not all humans agree. Most people tend to think of beavers as a nuisance as pasts but it turns out that beavers are very beneficial to the ecosystem. Here in the easy river valley of southern germany water buffalo are helping keep these fields healthy organic farm license is bringing them in for the winter. Come on sweetie come on. The water buffalo will spend the winter months at the familys farm. During the summer the water buffalo had some company here before us. With the buffalo gone its time to get some advice. Of wildlife biologist is often called in when beef is looked like they might come into conflict with farmers or other local reza. Its this past summer the beavers built a dam along the edge of the meadow. The other country has been working herd thats pretty fresh out there raising the dam for the winter. Obviously high for just a few you know were really glad to be there built this big dam along our pasture this year because as you see that allows the water to flow into the grazing areas. If youre here i didnt serve us if we go to the dentist our water buffalo need watering in wallowing holes to regulate their body temperature during the hot summer. Only. Activity without the beavers activity here wed have to either get water for the animals from outside or take them off the pasture. But not everyone is such a fan of the dams the beaches build. Tend to see confluence when beavers build their dams and places that people are also using. This dam for example its created this wet area which can be used by other animals. And theres a part there is no longer accessible because its so wet that anyone driving on it would get bogged down so the entire valley several hectares of land is no longer accessible for human use and he say that beavers set up shop because they like eating the corn from that field they also use the corn stalks to build their dam but that block the drainage and so now the areas under water this is what you tend to see when humans use land thats too close to water. Along this stretch of land adjacent to the east river the local villages arent bothered by the dams its a good spot to study the long term effects of before activity. Time and those the area like the back of his. Decision here those who weve been studying this habitat for 25 years the winter is an especially good time to see whats going. Happening. In dom the vegetation has receded and you can see the dam better and move along here more easily with. The nearby university of applied sciences carries out a lot of Research Projects here the 1st signs of beaver activity were detected here in 1909 and researches have been monitoring the area ever since. Just this used to be a relatively narrow stream with pastures to the right and left of it a small stream the landscape is totally changed in that the 1st choose which is the to less than 80 centimeters deep to build the dams the water behind the down that rises creating the beaver pond. I. Didnt or to keeps flowing into the pond digimon chile bursts its banks those streams of water branch out eventually a complex ecosystem imagist with patches of standing water as well as small streams some moving slowly others small quickly. We start to grow along the pond submerged trees die off and a marshland emerges nearby this gives rise to a vibrant most a a very taboo taps. This year will go because to me its fascinating to see how such a small animal can shape and transform an area. To build a dam here thats more than 120. 00 metres long and several generations of them kept doing it and its all in your children at least. The small streams to circumvent the dam on to study carried out by the university of exeter showed that the dams actually improves the water quality. Thats because the dams act as natural filters removing suspended solids phosphate and nitrogen from the. Water downstream from a beaver dam the water contains about 70 percent fewer suspended solids 30 percent less nitrogen and 80 percent less phosphate on average than the water on the other side of the barrier. The sediment is deposited upstream of the dam where its used by plants such as reeds which an average by the phosphate and nitrogen. The reed filled marshland the various will show ecosystems and the decaying would provide a rich habitat for many animals some quite uncommon zuki you can really see how life has returned to the area starting with the dragonflies before we only had a few dragonfly species but now the experts have found 30 different species of them here then there are the amphibian and bird species which are now flourishing you just have to really put in here. Many long term studies confirm that beavers use the diversity of species in their habitats the busy creatures on pests atoll but valuable allies in the fight to preserve our rapidly dwindling biodiversity. Thats also this way kong tomorrow today nice that you could join us next time well have more exciting stories from the fields of science and technology until then. The fall. He told the court the feeling. That i see a sure i see a strong not. A little doubt beethoven i cant even begin to imagine my. Children. Starts to come for 16 on g. W. With 3 different languages we fight for Different Things thats fine but we all speak up for Freedom Freedom of speech and freedom of press. Giving freedom for its global news that matters w. Made for minds. Like. Mughal or just love food for the russian soul. Steve. So many different walks of life. Some are. Oddly troubling but all of them come straight from the heart to look for a cd or even when theres no money delusion a marsh 4 inches. From news of the world to their final resting place the russians r t w documentary. The search for your 5 keys to safer food. Keep clean to prevent. Oh. Great drawings cook foods to avoid cross contamination. Cook thoroughly to kill microorganisms. Keep food safe temperatures. To prevent bacterial growth. Use safe water and safe well materials to avoid content. Producers are the ones primarily responsible for the safety of the food you buy but you can protect yourself and your family from diseases and home by plying the 5 key is to say for food use them you also have a role to play. This is d. W. News line from her land lebanons Prime Minister is due to announce the resignation of his entire government the move follows days of angry protests in the aftermath of massive explosions that killed dozens and left much of peer groups in ruins look at the latest from our correspondent in the lebanese capital also coming up bella bruce erupts and anger after the countrys president ial election the defeated candidate claims the result was raining to after the government claimed president lukashenko had won some 80 percent