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news, the headlines. anger at the treatment of fans at the champions league final in paris. the match is delayed andsome supporters claim they were tear gassed and prevented from entering the ground. real madrid win the match, after a 1—0 victory over liverpool. the spanish football side take the title for a record fourteenth time. heavy fighting is continuing in eastern ukraine, where russian forces are trying to capture the city of severodonetsk. the russian ambassador to the uk tells the bbc that moscow will not use tactical nuclear weapons in the battle for ukraine. president biden renews his appeal for tighter gun control following the texas elementary school shooting as the parents prepare to bury their children. legendaryjockey lester piggott, who won the derby nine times, has died at the age of 86.

now on bbc news it's time for 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, whilejumping 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 rememberjust 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". i just 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 thanjess ever had. would you have been a better athlete if you had trained in accordance with your periods? it is if you had trained in accordance with your periods?— with your periods? it is a good question- _ 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. 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. the 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 men. even the wearables that work with her own fitness app come with bias inbuilt. it tells me if my body temperature goes up, or if i'm ovulating or are pregnant. with 12 million users, the clue

cycling tracking app includes one of the biggest datasets. what kind of insight are you gleaning for the first time? one particularly fascinating study we're doing with researchers at mit. we are using clue data and pairing that with air pollution data, taken in occurrences like the california wildfires. this can help us draw conclusions like the impact of pollution on fertility, for example. wow, that is fascinating, would never have expected that to be a factor. natural cycles pairs with a thermometer and its 2 million users are also shaping health beyond menstruation. you are actually in temperature data able to see covid hotspots when it broke out in early 2020, because we saw an increased number of temperatures being excluded by the algorithm. the future of healthcare is really to get early insights and have preventative measures, rather than get sick and get treatment. so 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 data is not misused. it's good to be aware that no product is ever truly free, so the company has to monetise either by 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. at times now with roe v wade, it is terrifying, and we want to be able to support women and their choices. i don't think we can assume that just because we are a european company that gdpr will protect us. yet as some prepare for potential hurdles ahead, new options like this saliva based fertility kit continue to bring new data to light. we collect the saliva, ifold it over, and then i put it

in my littlei nne reader. amelia chose inne after having her contraceptive device removed. it is very easy for me. at the beginning, i had a few times where it didn't, yeah, my saliva was undertaken appropriately, but now it suits for my day very well. the kit costs around £300 for a year, and some might not like trashing used swabs each day. but if one solution isn't perfect, users can always pick and choose. combining the fertility and cycle tracking app clue makes me feel more secure because i have the best of both worlds, many symptoms i can track in clue and the progesterone levels, it's not fully developed, so i willjust wait and, yeah, be part of the process. time for a look at this

week's tech news. the facial recognition company clearview ai has been fined more than £7.5 million by the uk's privacy watchdog. it has found the firm had been collecting pictures of people's faces without consent. the company says its technology has been "misinterpreted". it what's thought to be a world first, police in the netherlands have used deepfake technology to try and solve the killing of a teenager nearly 20 years ago. officers released constructed footage of the victim, calling on people to speak up about what they know. translation: in order to reach the right people in this case, - the witnesses who have information about the circumstances, it is necessary to touch people's hearts. with the deepfake technology we were able to let sedar make his own appeal. no car charger? no 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, and 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 will let you flick through old street view footage of the same location. i hope i mowed the lawn 15 years ago. you may have seen casey neistat touring first class cabins in the clouds, hanging from helicopters in hollywood, or snowboarding the streets of new york city. he has had his own tv series, acted in movies, founded and invested in tech companies, and is now turning his talents to feature—length documentaries. i sat down with the viral star, virtually, of course. hello, how are you doing, casey? i'm just happy that we all have our glasses on. the movie at large is a sort of a broader commentary on the pros and cons of what happens

when there is no distance between sort of the creator and the audience. under the influence follows the meteoric rise and fall of fellow youtuber david dobrik. what happens with unchecked influence? what happens when there are no speed bumps, no filters between this young twentysomething man who has this tremendous audience of tens of millions of subscribers, and billions, with a b, billions of views, with a degree of influence that was, i don't know it has been seen before. of influence that was, i don't know the things that led to his success were very much the same things that led to his undoing. in the film, david's skyrocket to fame stalls when a member of his so—called "vlog squad", durte dom, is accused of sexual assault. in light of a news article, his sponsors drop him and youtube demonetises his uploads. just weeks later,

though, 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 back 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 platinum jubilee. 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. 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? 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 knew just 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.

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! 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. back 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 showing their paws or their ears. 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. the second part of the weekend is not as optimistic as the first. there is a risk of sharp showers around. that said, we have seen some sunshine around this morning. you can see this in southampton share with the shower clouds starting to develop. showers have been a nuisance in the north coast already today and they will continue to be a problem as well. as the high pressure moves away from

the high pressure moves away from the north—west, the isobars are squeezing together and the wind is strengthening and coming from a ghoulish northerly direction. most of the showers have been drifting in off the north sea. one or two pushing down into the irish sea. as we go through the remainder of the day, expect to see more cloud developing, particularly where we have had the sunshine. a cooler afternoon in scotland. nine to 11 degrees on the east coast. we still can't rule out some showers. perhaps shower free into northern can't rule out some showers. perhaps showerfree into northern ireland and north—west england, but we will have more cloud and the showers are very hit and miss, some in cornwall and devon later on the afternoon possibly heavy and thundery. the top temperature of 16 degrees. this evening the showers will fade away and some keep going in the far north. temperatures falling into single figures. a chilly start to monday morning. but a subtle change in wind direction. we will see more

showers from the west with a north—westerly flow dragging the cloud in and they will drift steadily eastwards throughout the afternoon. lighter winds, so some of those showers could be pretty slow moving with the odd rumble of thunder. not everyone will see those showers, but again the temperatures will be a bit subdued for this time of year. 11 to 17 degrees as a high. low pressure with us as we move into tuesday and we draw in this feature here to illustrate we could have more showers and longer spells of rain across the far north and west on tuesday. early morning sunshine to begin with in england and wales and that could trigger some showers into the afternoon. with that sunshine perhaps a degree or so higher on tuesday. then the all—important bank holiday weekend approaches. stilla all—important bank holiday weekend approaches. still a level of uncertainty but it does look likely that it will warm up and dry out just a touch.

good afternoon. lester piggott — one of the greatest jockeys of all time — has died. he was 86. his family said he died peacefully in switzerland, where he lived. the nine—time winner of the derby rode his first winner, the chase, at haydock in 19118, when he was just 12 years old. here's our sports correspondent, andy swiss. lester has it in the bag! when it came to the art of winning,

few could match lester piggott. his statistics are staggering.