this is bbc news, the headlines: france and germany have urged president putin to engage in peace talks as russia continues its ukranian offensive in the dombas. the russian ambassador to the uk has told the bbc that moscow will not use tactical nuclear weapons in the battle for ukraine. president biden has renewed his appealfor tighter gun controls, following the texas elementary school shooting. mr biden is due to visit the town of uvalde — where 19 children and two teachers were killed — as the families prepare for the first of this week's funerals.

protests have erupted in rio dejaneiro, after the video of a black man being starved of air in the back of a police car caused shock and anger. the incident has reignited the long running arguements about how society treats black brazilians. now on bbc news, click. this week, we will catch up with an olympic superstar hoping to help women exercise smarter. i'm trying to run for a gold medal here, but i'm also very aware that i've just started my period. chris is braving the cold. still, he has some furry

friends to keep him warm. but what is he doing with his phone? who knows. show me your nose? and all aboard the new elizabeth line as paul's schoolboy dreams come true. this station is paddington, where this train terminates. all change, please, all change. i have always wanted to do that. on your marks, get set, go! can you believe that it's exactly ten years since this site was just getting ready to host the 2012 olympic games? it feels like it was yesterday that this olympic stadium was alive with the roars of the crowd cheering on the athletes. time flies. and when you plan a site like this — indeed, when you spend all that money, it's important to plan a legacy, how the place can be put to good use once the games are finished.

and the park still thriving with football, swimming, cycling and, generally, just being a nice place to come. and in a weird way, the same is true for olympic athletes, who only usually get to compete at that level for the first part of their careers. takejessica ennis—hill, who gave us so many great moments, even winning gold in the 2012 heptathlon. yeah, and infact, she ran the entire distance that we have just walked in 12.5 seconds, while jumping over stuff! and her career still took more twists and turns after that, with injuries, a remarkable return after her pregnancy to win at the world championships, and then taking silver in brazil. and since retiring from competitive sport she, like the whole park, is looking to the next thing. now, it's still connected to sport, as you would expect, and it is also connected to women's health, specifically menstruation. periods aren't something that's always openly talked about, and discussed even less in relation to exercise,

butjessica's new app helps women to work out better around their cycle, so shona mccallum has been to meet her to find out more. training hard in the gym, building strength, and getting a sweat on — but what if you are on your period? one occasion, i was at thejunior european championships and i remember just running that 800 metres thinking, "i'm trying to run for a gold medal here, "but i'm also very aware that i've just "started my period". ijust rushed off the track and felt like i couldn't have — i just didn't absorb that amazing, like, gold medal moment. jess ennis—hill was at the top of her sport. olympic and world champion in the heptathlon, she had physios, dietitians, and coaches looking at all aspects of her training programme, but nobody looked at when she was menstruating.

i always remember it being an awkward conversation, so i had a male coach and it was predominantly a male environment, and i remember, yeah, just having those small conversations of, you know, "i'm on my period" or "i'm a bit tired" or "i'm not feeling ioo%" but never feeling fully confident about having that more open conversation about how i felt and how it was making me feel when i trained. but it's notjust athletes that this affects. women make choices about training around their periods all the time. sometimes, you want to rest and other times, you want to run. that's because we have different hormone levels at different times of the month. our menstruation cycle is split into four different phases. they are period, follicular, luteal, and premenstrual. each phase is determined by the two

main hormones, oestrogen and progesterone, which are at differing levels, depending on where in the cycle you are. using this information as a guide, jess decided the best way to get her message across to women who wanted to keep fit was an app. after a couple of months of inputting your period data, the algorithm begins to recognise what phase of the menstrual cycle you are in and gives you tailored fitness options from things like yoga to high—intensity workouts. so, you do roughly a minute of that and then we could go into some core, so can position yourselves on the mat. so does your period affect your ability to exercise? well, the team atjennis thinks so, and it is something their users are keen to know more about. as a 45—year—old woman, i knew very little about the way my body works and i decided to learn about that. it seems to still be a taboo to talk about periods

and menopause and things like that and i think that's changing, and i want to be part of that. perhaps we don't know as much about our bodies as we should. but the area is still extremely underresearched and the academic studies which have been done may not be reliable. 42% of the research was actually low quality, so what we do have, the majority of it was kind of low quality in terms of they weren't really looking at the mentrual cycle hormones in terms of blood sampling and the gold standard methods, so not only do we have a research gap we have this quality issue as well. so, moving forward, not only do we need to increase the quantity of research we're getting, but we also need to make it better, so we can get to those sort of more accurate conclusions on female physiology. there are a lot of more popular apps available, including fitrwoman, flo and clue, so women now have more tech at their disposal than jess ever had. i think there is always that thought that because i am at high level athlete, it is that

i have more knowledge about moving my body but it is actually about everybody having the ability to tap into their rhythm. do you think you would have been a better athlete had you trained in accordance with your period? it's a really good question. i think i would have been able to train smarter. i think when you get to a certain level, everything, every small incremental change is hugely important. i think that maybe if i would have spent more time understanding particularly when to push myself in the strength room, for example, when i'm in that follicular phase, then i would have perhaps built more lean muscle and become stronger and, who knows, it may have affected my performance in a positive way. marth majority of medical testing has historically been done on males. the impact on healthcare is that women are using medical drugs and protocols that are made for man. even the wearables that

work with her own fitness app come with bias inbuilt. it come with bias inbuilt. it tells me if my body temperature goes up, or if i'm ovulating or are pregnant. �*iz goes up, or if i'm ovulating or are pregnant-— goes up, or if i'm ovulating or are pregnant. 12 million users, the clue cycling _ are pregnant. 12 million users, the clue cycling tracking - are pregnant. 12 million users, the clue cycling tracking app i the clue cycling tracking app includes one of the biggest datasets. what sort of insights value gleaning?— value gleaning? one particularly - value gleaning? one i particularly fascinating value gleaning? one - particularly fascinating study is for researchers at mit, we are paring it up with air pollution data, including things like the californian wildfires, helping us to draw conclusions about the impact of pollution on fertility. that conclusions about the impact of pollution on fertility.— pollution on fertility. that is fascinating! _ pollution on fertility. that is fascinating! we _ pollution on fertility. that is fascinating! we never - pollution on fertility. that is| fascinating! we never expect that to be a factor! it pairs with a thermometer and its usages are helping to shape it beyond uses. usages are helping to shape it beyond uses-_ usages are helping to shape it be ond uses. , ., ., ., beyond uses. temperature data, ou can beyond uses. temperature data, you can see _ beyond uses. temperature data, you can see covid _ beyond uses. temperature data, you can see covid hotspots - beyond uses. temperature data, | you can see covid hotspots were broke out in 2020. because we

an increased number of temperatures being excluded by the algorithm and the future of healthcare is really to get early insights and have content — at present —— preventative measures rather than get sick and have treatment. the potential— and have treatment. the potential of _ and have treatment. the potential of data - and have treatment. the potential of data is - and have treatment. the potential of data is huge but with so much information it may feel overwhelming, especially with so many free, paid for and subscription services on offer. there is also the challenge of making sure that data is not misused popular it's good to be aware that no product is ever truly free so that company has to monetised by either running ads or selling your data to a third party. and today as abortion legislation comes under scrutiny in the us, there are new concerns about protecting app users from the long arm of the law. we protecting app users from the long arm of the law.— protecting app users from the long arm of the law. we want to be able to _ long arm of the law. we want to be able to support _ long arm of the law. we want to be able to support women - long arm of the law. we want to be able to support women and l be able to support women and their choices. irate

be able to support women and their choices.— be able to support women and their choices. we cannot assume 'ust their choices. we cannot assume just because _ their choices. we cannot assume just because we _ their choices. we cannot assume just because we are _ their choices. we cannot assume just because we are a _ their choices. we cannot assume just because we are a european i just because we are a european company— just because we are a european company that their gdp able protect— company that their gdp able protect us. company that their gdp able protect us-— company that their gdp able protect us. some prepare for some potential _ protect us. some prepare for some potential herders - protect us. some prepare for some potential herders a - some potential herders a letterhead, new options like this new saliva based fertility kit brings new data to light. you collect the saliva, fold it over and then you put it here. she chose this one after having a contraceptive device removed. very easy for me, at the beginning i had a few times where my saliva was not taken properly but now it's it's my day very well. properly but now it's it's my day very well-— day very well. the kit costs around £300 _ day very well. the kit costs around £300 for _ day very well. the kit costs around £300 for a - day very well. the kit costs around £300 for a year - day very well. the kit costs j around £300 for a year and day very well. the kit costs - around £300 for a year and some may not like trashing used swabs every day but if one solution is not perfect, users can always pick and choose. combining the fertility and the

clues make me feel secure because i have the best of both worlds. many cycles i can track both levels. it is not fully developed so we willjust wait and, yeah, be part of the process. and, yeah, be part of the process-_ and, yeah, be part of the rocess. ., . , process. looking at tech news. a company _ process. looking at tech news. a company has _ process. looking at tech news. a company has been _ process. looking at tech news. a company has been fined - process. looking at tech news. | a company has been fined more than £7.5 million by the uk privacy watchdog. it found the firm has been collecting pictures of faces without consent and the company says its technology has been misinterpreted. in what is thought to be able to first, police and the netherlands have used deep fake technology detritus of the killing of a teenager nearly 20 years ago. police officers released constructed footage of the victim calling on people to speak up about what they know. translation: in speak up about what they know. translation:— translation: in order to reach the riaht translation: in order to reach the right people _ translation: in order to reach the right people in _ translation: in order to reach the right people in this - translation: in order to reach the right people in this case, - the right people in this case, the right people in this case, the witnesses who have

information about the circumstances, it is necessary to touch peoples hearts with a deep fake technology and we were able to make his own appeal. were able to make his own a- eal. ., were able to make his own a. eal, ., . ., were able to make his own a. eal. ., . ., ., appeal. no car charger? no problem- — appeal. no car charger? no problem. this _ appeal. no car charger? no problem. this pop-up - appeal. no car charger? no problem. this pop-up solar appeal. no car charger? no - problem. this pop-up solar car problem. this pop—up solar car park has been unveiled this week, built out of recycled shipping containers, it is designed to be operational wherever it is needed within 2a hours can hold enough charge for 12 cars and to celebrate 15 years of google street view, you can now turn your phone into a time machine! the latest version of the ios and android app version of the ios and android app can let you flick through the old footage of the same location! i hope i mowed the lawn 15 years ago! you may have seen these person entering first class cabins and hanging from helicopters or snowboarding the streets of new york city. he has had his own tv series, acted movies,

founded and invested in tech companies and is now turning talents to feature length documentaries. i sat down with a viral star, virtually of course. hello, how are you doing, casey. course. hello, how are you doing. casey-— course. hello, how are you doing, casey. course. hello, how are you doina,case. ., doing, casey. happy we have the classes doing, casey. happy we have the glasses on- _ doing, casey. happy we have the glasses on. the _ doing, casey. happy we have the glasses on. the movie _ doing, casey. happy we have the glasses on. the movie is - doing, casey. happy we have the glasses on. the movie is a - glasses on. the movie is a broader commentary on the pros and cons of what is happening when there is no distance between the creator and the audience. between the creator and the audience-— between the creator and the audience. . audience. under the influence follows a meteoric _ audience. under the influence follows a meteoric rise - audience. under the influence follows a meteoric rise and i follows a meteoric rise and fall of failed youtube david break. ~ . fall of failed youtube david break. . ., ., , , , fall of failed youtube david break. ~ ., ., , , , ~ break. what happens with aln checked influence? _ break. what happens with aln checked influence? when - break. what happens with aln l checked influence? when there are bums? filters? between this young twentysomething man who has this tremendous audience of tens of millions of subscribers and billions views with a degree of influence that was, i don't know has been seen before. the things that led to

his success was very much the same things that led to his undoing. in same things that led to his undoinu. undoing. in the film, skyrocketing - undoing. in the film, skyrocketing to - undoing. in the film, j skyrocketing to fame undoing. in the film, - skyrocketing to fame stalls when a neighbour of a so—called log squad is accused of sexual assault. in light of a news article, sponsors drop him and youtube to monetise as his uploads. weeks later, he is back! the fact that in the shadow of all those revelations, that accountability did not yield the sort of consequence that certainly the journalists and the survivor herself had anticipated, to me that is such a sort of a bleak outcome. it is, you know, what does it say about our society that there is such little accountability for wrongdoing in the world of influence and social media? i want to apologise to herand herfriends... david has says he believes

the allegations and has offered an apology. durte dom has also apologised, but says it was consensual. as well as the film world, casey is also in the tech industry, founding video app app beme backj in 2014, which he sold to cnn for an estimated $25 million. we are officially live in the app store. we have seen such tremendous outcomes because of the opportunities created with technology. but there's a downside to that. there are real negative outcomes, there are real dangerous outcomes, and that theme exactly is what my movie explores. good god, david! that was nick, talking to casey neistat. now, earlier we talked about the importance of olympic sites having a legacy and being useful and accessible to the wider community. one of the ways that is happening here in london is that, that purple circle up there means that this place

is one of the new stops on a new train line that crosses london. originally called crossrail, work started in 2009, but has since been renamed the elizabeth line, opening just in time for the queen's platinumjubilee. but before the public got on board, paul carter went for a sneak preview. please, mind the doors! this is the elizabeth line. london and the south—east of england's first new railway in a generation. it is also the uk's first newly built fully digital railway. and as click�*s resident train enthusiast, i was lucky enough to be one of the first people to ride the newest stretch of track. it has finally opened to the public, operating as three separate sections. when it begins fully operating as a single line next year it will be a 73 mile railway, carrying an estimated 500,000 passengers a day.

in the core section of the line, running underneath central london, the £1 billion fleet of trains are almost entirely automated. this is a dream come true. setting off from stations at the push of a button. once you are ready, check monitors again, press start, and the train will take off. that's it. laughs. that's so surreal! in the central section, trains and signals communicate with each other automatically, meaning trains can run faster and much closer together than if driven manually, allowing an increased service frequency. we are running 12 trains an hour, and the reason we can drive the trains a lot faster is because the computer controlling it is maintaining the distance between the trains ahead. so there is always a safe gap between them all, which can't be maintained on the normal network because of where the signalling system is set up. now, it has been a bumpy ride to get to this point. when construction began way back in 2009,

it was europe's biggest infrastructure project. but it was beset by problems, and has opened 3.5 years late and £4 billion over budget. many of the delays to the project were put down to the complexity of integrating three separate signalling systems. to the east and to the west of london, drivers operate the trains manually, where more traditional signalling is in operation. the central core however uses a system of signalling called moving block. historically what you would have is fixed block, so you have a colour light signal that tells the train that the next block is clear ahead, whereas with us, the train is making its physical own block as it goes along the track, meaning you can run as many trains as you want to. i went along to the control room for the elizabeth line in east london to see how it looks from the other side. this is where the magic happens. this is where all the magic happens. as is often the case, technology also requires a human helping hand. you are currently shown as not cabbed,

you don't have a route set ahead of your train. is there an issue with your unit? indistinct speech. i will do that now, if you can just attempt to get your train on, if it is successful i will call you back and give you a route out. we have just seen there two instances of the benefit of having someone who is skilled and able to deal with problems here as well as having this kind of technology. yeah, 100, yeah. this is really the first step to going to digital railways, to be honest. in the future it's going to be called ertms. ertms is still under development and once that occurs, there's nothing to stop other railways going fully digital, main lines at a lot higher line speeds. from a technological perspective, the elizabeth line offers a glimpse into what the future of train travel will look like. but call me a romantic, i am not ready to see the human element completely disappear from our railways. this station is paddington, where the train terminates. all change please, all change.

always wanted to do that. oh, you would have loved that. oh, i so would have, and i'm sojealous of paul! paul loves trains but not as much as he loves dogs. only this week someone else has got to do the dog story for the programme. now, spencer, what can you tell me about dogs' noses? um, they are wet. that's true, but they are also unique. so you know how in some parts of the world dogs are microchipped in case someone loses a dog? well here is another idea — chris fox has been to norway to find out about it. we've always had a nose for a good pet tech story, so when i found a company developing phone—based face id for dogs, i knewjust where to come to test it out. somewhere with lots of dogs. until now, the usual

way we identify dogs was with microchipping, and in some countries it is even the law. but a company from south korea has developed an app which can identify dogs a little less invasively. all right then, yup! laughs. this on this phone i have got petnow, which is using the dog's nose print to identify the dog, just like you can use a fingerprint to identify a human, a dog's nose print is very similar. so let's get to know this dog. come here! whoa. it turns out it is actually quite hard to get huskies to sit still for any length of time, especially when you are trying to scan their nose. show me your nose! it takes the phone a few seconds to take pictures of the dog's nose and analyse them in the cloud. it also saves the pictures it takes to the phone's camera roll so you can enjoy them later. in the end, with a bit of help from

professional husky musher nicholas, i was able to get a successful scan. ah, yes, it's found it. ok, and the app is now telling me this is emma, and not only that, it is showing me that emma has been reported missing, and says where she was reported as missing, and i can share my location with the owner so they can be reunited. obviously emma is not really a lost dog — the huskies have been logged in the app so we can see if we can tell them apart. unlike a microchip which can be cut out of a stolen dog, you can't really remove a dog's nose, not without spoiling the dog. and by using the phone's camera to scan, anyone in theory can check a stray dog without any specialist equipment. backed at base i spoke to petnow to find out why they'd settled on nose prints for dog recognition. there may be paws or ears or iris, but some dogs really hate going their paws or their ears.

——showing. but the nose is exposed all the time, and after the dog becomes 6 months old, the nose print stays their entire life, so we believe it is the best part for identification. what inspired you to make a nose print recognition app? in south korea, the number of dogs and cats which are lost or abandoned is also increasing. the vet bills are not standardised in south korea, and some owners are simply not willing to pay the high bills when their dogs or cats become really sick. some of them just choose to abandon them on the street. so we wish to build up a world without lost or abandoned animals. some kennel clubs already used dog nose prints as a form of id, but petnow hopes its app will become mandatory in south korea to help reduce the number of dogs that are abandoned by pet owners when a big vet's bill arrives.

to do that they will need the backing of government, and a huge marketing push so that everybody, including people who don't own a dog, knows about the app and how to use it. that was chris, always good at sniffing out a story. i did ask her not to do that. um, let's go, shall we? thank you very much for watching, we will see you soon. bye— bye. hello there. on saturday, the lion's share of the sunshine and warmth was found across the south and the west of the uk. temperatures were above 20 degrees in a few places, and at newquay in cornwall, beautiful blue skies overhead. further north and east,

there was a bit more cloud and it did feel quite a lot cooler. and as we move through sunday, with high pressure to the north—west of us and low pressure to the north—east, that'll be driving quite a brisk northerly wind. and that will bring a rather cool feel for many. temperatures will be a little disappointing for the time of year. so, generally speaking, it will be rather cool through sunday, particularly where we have areas of cloud and some showers, which could be heavy and thundery. equally, there will be some spells of sunshine in between, but we'll see showers from the word go across parts of wales, the midlands, some north sea coasts as well. showers drifting towards the south west of england, where they will turn heavy and thundery, and for many places, it will be rather cloudy. not least in the north east of scotland, where that cloud will produce some spots of rain. coupled with quite a brisk north or north—westerly wind, it will feel decidedly cool, just 9—11 degrees. maybe 1a in glasgow. not too many showers for southern scotland or for northern ireland.

scattered showers across england and wales, especially for south west england and south wales, where some of the showers will be heavy and thundery into the afternoon. top temperatures 15—16 degrees. now, as we head through sunday night and into the early hours of monday, many of the showers in the south will clear, but at the same time will bring areas of cloud down across scotland. some showery rain with that, a few showers running down the east coast of england as well. and it's going to be quite a chilly night. temperatures widely down into single digits. one or two places 3—4 degrees briefly around dawn on monday. for monday, yes, we'll see some spells of sunshine, but often quite large amounts of cloud and some heavy, potentially thundery showers breaking out. just about anywhere could catch a shower. and those temperatures still a little below par, 11—16 degrees. now, as we look deeper into the coming week, this area of low pressure is going to wobble its way westwards, so that will bring some showers at times once again on tuesday, some heavy, thundery ones in places. signs are it will slowly dry

out a little through the week, but there's still a bit of uncertainty about the jubilee weekend forecast.

this is bbc world news. i'm chris rogers. our top stories: france and germany urge president putin to engage in peace talks, as russia continues its offensive in the dombas. the russian ambassador to the uk tells the bbc that moscow will not use tactical nuclear weapons in the battle for ukraine. we have a very strict provision on the issues of the use of tactical nuclear weapon, and it is mainly when the existence of this state is in dangered. president biden renews his appeal for tighter gun control following the texas elementary school shooting, as the parents prepare to bury their children. and protests erupt in rio de janeiro after a video

of a black man being asphixiated in the back