about our war or worry about. i think that you are is over this is the crisis of our time it's a financial trouble like any others and we live in a competitive world to school to it's cool it's cool cool water used to be free big the world was changing the most important promoters you can. call. it was a war. or commodity stuart's march 22nd oh and b.t.w. . this is d.w. news and these are our top stories police have made arrests at a vigil in south london in memory of murder victim sarah ever heard the virgil was officially cancelled after a court denied permission for it to go ahead nevertheless 100 still turn out to pay their respects earlier on saturday

a police officer appeared in court charged with ever its murder. astra zeneca has again cut its forecast for the number of vaccines it will deliver to the european union and now says it will deliver just 30000000 doses in the 1st quarter instead of the 80000000 originally agreed astra zeneca is blaming the shortfall on production problems and export restrictions. several people have been killed in demonstrations against me on mars military rulers at least one person was shot dead in the city of several others were killed in the main city and gone where protesters defied a nighttime curfew to hold a candlelight vigil within 70 protestors have been killed since last month's. the state of the news from berlin you can follow us on instagram and twitter at the w news or visit our website d w dot com. org

. we've traces everywhere and everything we touch. even when we breathe. most of the time these choices are invisible but they can still reveal a lot about us for example i think the prince and the proteins in our head. since the start of the coronavirus pandemic we've had to contend with the loss of these invisible traces we leave behind. viruses that are exhaled into the air for example . which have turned our world upside down. to. join us as we play detective on tomorrow today the science show on d w. images like these have become the new normal people queuing to get tested for covert 19.

the tests are made to get the ban demick under control and better understand the spread of the disease. there are 3 space it approaches the antibody test detects a past infection and requires a blood sample. that is tested for antibodies that would have been produced by the immune system during the illness. the other 2 tests are meant to detect occurrence infection of cells kovi to. the antigen test requires a swab from the back of your nose or throat and detects protein it's one of the surface of the virus. the results are quick but not as accurate as a p.c.r. test here you also need saliva. or a nasal swab. these tests are engineered to identify genetic material

called our in a. the p.c.l. a test is the most reliable. but it takes up more time and resources and so it cannot be easily used for mass testing. but pool testing for the virus could change that mathematicians in rwanda have now developed an algorithm to do just that. in the fight against the pandemic flu wonders coronavirus task force relies on comprehensive contact tracing. to get an up to date picture of how much the corona virus has spread rwanda regularly tests a cross-section of the population using an ingenious strategy called pool testing.

the brains behind this strategy is professor will threaten defun who is director of research at the african institute for mathematical science or a i.m.s. global network. if you go to the community and just people it doesn't tell you how many people are actually infected because you're going to everybody so you always sample and sort of go from the sample to the truth to reality you know in my mind to go more those. are the calculations involve complex algorithms and define has translated them for us into an example from everyday life. the idea of your important thing is really simple so imagine that you have 9 cups of beans and you're toward one of those was bobbins. early in order to church which grew up as the barbarians he was libyans and dearest sumo find out the abuse is bitter those

who are there not only takes a long time to go to a world group owns or use a lot of gas if you're doing my own cooking mon portables. the mathematician resorts to a simple yet effective trick he combines bin samples from different parts of all the beings in this sample pool are good you no longer has to test each part individual he only has to perform additional tests if there are bitter beans in the sample. the principle can be applied anywhere you can create groups for testing that's why it can also be used to combat covert 19. in rwanda sets of 10 and 20 samples are combined and tested simultaneously. if the pool test result is negative all the subjects in the pooled sample are declared as not having coded 19. if the pooled result is

positive then each sample is retested individual. the advantages of the pulling out part is just to reduce the cost spread to the for the adults to do the turnaround time for the bar for results and also to test the massively in the community also the group does. that concern for the community so those are the men advantages for these. but if the virus has spread dramatically pulled samples test positive too often and retesting becomes costly and time consuming so far however africa has low numbers of cases compared to western countries and the method is proving useful there this is really hurtful for the african countries but not only the african countries even for the roping countries since we developed this and the published. pulling up close tonight

a paper out so we have been approached by several countries. ghana and kenya are now applying the strategy to group testing enquiries have also come from the us and the university of edinburgh in scotland is using the method to test its students the method actually originated in 1903 american economist and researcher robert dorfman was the 1st to develop tool tests to screen u.s. army soldiers more efficiently for syphilis since then the strategy has been further developed and is also used to test for other sexually transmitted diseases malaria and blood banking there's a lot of interest in this approach i think it's it's a no brainer that we need to be. optimizing the use of resources. to develop the method the cameroonian collaborated with his rwandan colleague tessa and a i.m.s.

founder neal to rock it's a pan african response to the continent's challenges. it's really extraordinary that you can write. on the board so many questions and no tell you how. this is spread in a population how what happens when you truly are born into the. out what happens to cars how computers work so all of these are my markets on the. resort of people just investigating doing analysis trying to understand better how things around them work. the a ins network places great value on training young scientists across the continent they are confident that the next albert einstein will come from africa. training young people to how to obvious knowledge and this ability to use mars to solve problems is wonderful and i'm very proud to be associated with this vision to be

helping to drive it forward. for example has been proof that this is vital thing to do. did you know that p.c.r. technology which detects. a virus is the basis for many other tests. it's used to amplify specific d.n.a. regions can be analyzed. p.c. also breakthroughs in forensic technology many possible to reach and this information from the smallest human traces this genetic fingerprint can be invaluable information at the scene for crime. on t.v. shows solving crimes always look so easy clues however tiny are soon analyzed and lead directly to the perpetrator. in real life things often look quite different.

this is the state police forensic science institute in kiel normally crime scene technicians go to a crime scene. this time it's come to them that i think is the photographer could come in with us to take a few pictures of the crime scene that will make it easier for us afterwards to watch. the 1st step is to look for fingerprints cupboards have been ripped open the interior is a mess it looks like someone has ransacked the mobile home. under the table there's a knife with a bloody blade. everything has to be documented and photographed where it's found later it will be studied in a lab. a crime weapon but no victim whose blood is it. what investigators do what a crime scene is gather evidence as much as possible. even things that look irrelevant can prove to be extremely important. person in by what we

found a small piece of paper on the floor between the front say it's a candy wrapper have we secured it because it doesn't look like it belongs here it looks more like it might have fallen out of a pocket and under the table we found a knife that appears to have traces of blood so the knife is of interest not only for fingerprinting but also for day in a analysis and possibly for any fibers sticking to it as well you would have floated awfully fast. there's a fingerprint on the candy wrapper but it's faint and incomplete this clue would once have been impossible to analyze today however it can be enhanced by a process called sputtering. the wrapper is exposed to vaporized silver in a sputtering kotor the silver condenses on the wrapper highlighting the fingerprint the technique was developed here at this institute just a few years ago. a photograph of the fingerprint is then digitally enhanced it's

now so detailed even sweat pours can be seen as tiny white dots on. lines of the print yes i think there is indeed a fingerprint here right above the lettering that means the spattering has performed a small miracle by carting the wrapper and so over the fingerprint is raised against the background and we can see it more clearly. so. i think we should apply the tape to the back of the safe. meanwhile fiber specialists have taken over the crime scene. first and foremost we have to secure the evidence wherever there might be any 5 bits of course we try to imagine where the pair betrayed a was and have a crime was carried out that's our main focus but in principle we have to secure everything because we can never really imagine exactly what happened. and we just

have. this. even the slightest contact with upholstery is another to transfer fibers garments shared fibers all the time when you buy and if the 2 of us were wearing pullovers and i hugged her or we rubbed against each other on the bus my fibers would get on her and hers would get on me and. everybody carries a distinct a mix of fibers around with them mostly fluff from their own clothes. fibers from a crime scene can't lead to the perpetrator by themselves crime scene technicians also need to compare them with the clothes of a suspect. then they can tell whether or not it's fibers match ones from the crime scene. this involves picking out relevant fibers among thousands of others. looking at the 1st thing i do is look at all the colors through the microscope magnified say $250.00 times i look at both the colors and

the shapes of the individual fibers to say if it's them or not. i think i'm like a bloodhound on the lookout for a single 5. in this case family looking closely at the red ones i mentally block out the other is otherwise i go crazy doesn't really france and. once the visible clues have been identified and analyzed it's the turn of the invisible ones the expert in invisible clues needs breathing equipment and total darkness. the chemical he sprays lights up for a few seconds wherever it's in contact with traces of blood or handprint appears next to the door and smears of blood along the side of the vehicle. is going to go through it all the evidence here is compatible with a person exiting the mobile home and moving perhaps injured unsteady on his or her

feet and finding support along the side of the vehicle. as its. victims out things are not what they appear the police officer had left the wrapper in the mobile home and the fingerprint was hers. the fibers were indeed from that red pullover but it belongs to a colleague in the lab. and the blood on the knife came from the butchers around the corner so there was no crime it was a dummy run at a training exercise an internal police matter still the perpetrators are making a getaway taking the scene of the crime with them. for almost 200 years now photographs have captured fleecy moments originally in black and white soon it became possible to duplicate photos using a negative to make more prints each point of light became a dot in the image

a lot of data to capture a moment but. first has fade with time but what about the digital photos. oh i come from guyana had a question about. how long can data be stored. humans have recorded their languages and their knowledge in the form of drawings and symbols since prehistoric times. on the data carriers from back then play tablets or stones much of the information survive for thousands of years. as a result these ancient days are carriers can be read and decoded today. modern storage devices can carry a lot more data even though there are a lot smaller. but the lifespan of most c.d.'s and d.v.d.'s is estimated at less than 100 years. days or that stored on the

kind of huge servers operated by large companies should theoretically last forever as long as the days is repeatedly copied and as long as defective hard drives are replaced. in order to keep the ever increasing amounts of data under control researchers are developing smaller and smaller storage devices in the future synthetic d.n.a. could replace conventional data carriers. these artificially generated genetic strands would have more than a 1000000 times the capacity of modern hard drives. on the reconstruction of neanderthal d.n.a. has shown the d.n.a. molecules are still legible after thousands of years. another method of storing data in courts is 5 d. technology uses namo lasers to write information into 5 dimensional fused courts of mind boggling speed. these glass just the size of coins can store up to 360 terabytes. and they last

a very long time to turn 18800000000 years. whether or not there's someone in 13800000000 years who can read the data is another question. 59 states have a 59 with 210. that is a lot of data and it's the amount estimated to have been created captured and consumed by the end of 2020. in the next few years the amount is forecast to almost triple. in order to preserve the information it has to be constantly copied and uploaded onto new data carriers plus anyone can get in on the act of producing more and more data. for example it's estimated that in 2020 over

a trillion digital photos were taken from. data that is meant to capture memory. the i asked our viewers what data would you save forever and how. cool rides your wedding day the moment of birth and anything to do with love so how romantic. it says here is a little more pragmatic we should preserve our knowledge of metal working as well as plants and seeds on a floppy disk in order to ensure food security in the future. mohamed recommends internal rather than external storage writing i want to store everything in my brain we tend to lose the ability to remember things as we age hopefully in the near future we'll be able to upload data to our brain finally randy writes he's most interested in saving images thousands of family photos and videos from birth to wedding to grandchildren in his case 50 years or 28 terabytes in total thanks

for getting in touch. a snapshot can only capture so much of a person but these days it's possible to bring old photographs back to life. all of a sudden subjects can move their hands or blink. uncanny even if it doesn't look quite natural. let's you know you scientist marie curie is among those here think even this kind of treatment in her case there's no doubt that this video isn't authentic with people who are still alive telling real from fake can be more challenging. these days all it takes is one photograph to create a fake video in their time at all that's pretty impressive. with the help of artificial intelligence research is can now bring any photo to life in under 3 minutes manipulating the image remotely. 'd these examples

took just a few minutes to put together and they show what this technology is already capable of. 'd to raj ebrahimi is team of specialists chiefly working on ways to automatically identify deep fakes like these these detectors will be crucial in the future. also the fake detectors are not going to be perfect but they will be able to detect the majority of the deep content that is going to be distributed and in many cases this is good and what is important that the solutions have to be done in such a way that they can reinvent themselves and evolve as the technology for the prick's evolve. deep or fake so also an issue in business 'd it's becoming increasingly important to track down fake images in cases of insurance fraud for example. image analysts are researching ways to spot the markers of

a phony image. intelligent image recognition software is fed countless fake images and videos and learns how to recognize anomalies. assoon as clear markers are detected a red box indicates that something has been manipulated. if you look at depicting. 6 months ago a lot of the video was very very easy to detect they were distorted you could immediately see there's something wrong with them if you look at them today they are at the verge of becoming very believable is becoming more and more difficult to detect whether a video is fake or not. it's a matter of 3 to 9 months before 99 percent of people when they watch fake video they wouldn't know that it is fake

a bleak prospect or fact checkers fortunately fact checking company many comma doesn't yet encountered deep fakes every day but without new detection tools thanks but under a host is pessimistic. my hope for the future is that as more deep faith technology emerges the people tracking the fakes will have better tools to recognize the fixes eg. because so much misinformation is spread so fast on social media users will have to raise their game using the fact checkers golden rules i'm functionally timid as i firstly does oneself and i have to know myself in the media i consume that's very important but if you fall for something from a media source that you trust deeply then it becomes difficult next just to see who's writing where something comes from so you need to master search engines clearly i need to know how search engines work and be able to do comparative searches on top of that of course is the search for images so-called reverse image

search finally speed up the rate of information consumption and if something sounds overdramatic then maybe it's better to ask people who know about it or to bypass it when he started asking but that alone is not enough more education is also needed. now to get us and of course we want something to happen in the schools now comes the big budget are always shouting that schools need to do something yet we're saying that there's so much fake news on the. this is a problem young people are not on facebook. it's the $35.00 to $55.00 generation and now we've identified the core of the problems and we're not doing enough educational outreach to adults facts. ok let's give it a go what do you make of this video it was lightning striking a train track well it's a fake pay close attention to the trajectory of the flash it should really leave some burn marks in its wake but there's not a trace also the camera operator is way too calm and steady. but there's also

a clue in the title of the video here cd i computed generated images clearly faked . some also branded this video with a woman doing erotic in the middle of the military take over in myanmar. so what do you reckon is it real or fake. this shadow seems to suggest it's a fake they seem very truncated but if you look more closely you'll see that there are steps behind this supposed to be located at the royal lotus roundabout in myanmar comparing the image to that in the video reveals the markings on the ground the streets the flowerpots are identical in the video the silver posts must have been installed since the google image was recorded in 28. so the location appears

plausible and the shadows of the downs and that of the cars match up. the lighting is the same so this video is no fake. if outlet is right where you are going to move you. do you have a science question you'd like us to answer. send it in as a video text ovoid snail if we featured on the show you get it didn't surprise from us as a thank you come on just hours. and for more exciting stories check out our website or find us on twitter. that's all for now thanks for joining us on tomorrow today. will be back next week with more fascinating stories from the world of science and technology until then

by. time to do some painting and as a lawyer he could have earned a lot of money but he could not ignore the poverty in his country so he founded and b. the organization volunteers are showing up passion for helping. providing something that many shearers no longer no attention.

next d.w. . to talk tough. i know i keep irish dance crew koda are taking social media by storm. proving that modern choreography and cool phoenix tradition can also go file. the. 60 minutes w. . with him had a big gun because up close with the highest high you know if i had known that the boat would be a bounce may i never would have gone on

a trip but i would not have put myself and my harrison about intentionally. it's a game of the what are you to sleep with. that one little piggies and i have serious problems on a personal level and i was unable to live there but once i'm going to. want to know their story in full migrants terrified to come to reliable information for margaret's. valma a recent widow. live here in this county should best offer. i've never had a birthday party like other kids meet the new 15 year so be it i'm turning 14

soon and once again we won't celebrate so missy go because our mom doesn't have any money. i've never blown out candles on a cane.