this is bbc news, the headlines: sri lanka's president, gotabaya rajapaksa, will step down after protesters stormed the palace and set fire to the prime minister's house. hundreds of thousands of demonstrators descended on capital colombo after months of protests over economic mismanagement. sri lanka is suffering high inflation and is struggling to import food, fuel and medicine. as japan grieves for the former prime minister shinzo abe, voting begins in elections for the upper house of parliament, two days after his death. there are suggestions his murder could boost support for the governing liberal democratic party, of which mr abe was the leading statesman. the uk chancellor, nadim zahawi, has added his name to the conservative

leadership contest, joining a field of eight people, including two former health secretaries. now on bbc news, it's time to click. this week, we're at wimbledon to find out if ai can predict the winners, although spencer's concentrating on the more important parts of the event. choose my blanket design. got to get the food sorted first. lara gets her trainers on to put some of the latest fitness devices through their paces. they say that i run like an elephant. the question is, is it true?

probably! cheering. it's men versus machine as omar and paul kick off against the robots. and we check out the tools hoping to make sports more accessible. it's one of the biggest events on the sporting calendar. the players, powerful... ..light of foot... ..lightning—fast. it requires physical endurance and nerves of steel. and that's the reason that every year the crowds spill out to watch wimbledon. you see that there? that is centre court and it's been in that spot now for exactly 100 years. a centre court centenary. indeed. nice line. i know how much you love

wimbledon, but are you like my aunt who shouts at the tv for two weeks? i absolutely love it, and i absolutely am like your aunt. this is the most stressful two weeks of the year for me. my heart rate goes through the roof and i'm just watching the thing on tv. oh, you need one of my activity trackers. i've got a few to spare to track your heart rate. oh, yes. how did you get on with those? well, i'll tell you, and you, about that in a bit. right you are. yeah, wimbledon has been at the forefront of trialling new tech, both on and off the court, and we've been lucky enough to see a fair bit of it over the years. so there is no better place to anchor our sports tech—themed show. and we're going to start with something for the fans. tech giant ibm has partnered with wimbledon for more than 30 years, and this year, it's upgraded the official wimbledon app to tell the future. so for each singles match here, match insight is going to try and predict the outcome of that match, who's going to win, yeah? it is indeed. it's using, of course, the players' performance, but it's also looking at what the media buzz is. we combine that with other stats, other data, like the player tracking and ball tracking that hawk—eye

are doing, players' form, momentum, performance in the lead—up to and now during the championships. the brains behind this app belong to watson, ibm's artificial intelligence. and after absorbing all the data and the chatter, it'll make a prediction that's totally separate from the official seedings. these predictions are not going to just favour the person who's the highest ranked. no, and that's where it actually gets interesting because ours is very much of the moment, it's updated daily, so it enables us to suggest ones to watch. helpful if, like me, you really only know your rafas and your raducanus. but that's not going to stop me from using the app to make my own match prediction. ok, here we go. burridge versus tsurenko. 0h, blimey, that's uk versus ukraine. it's eurovision all over again. the trusted media, the experts think that tsurenko is going to win. the fans predict that burridge is going to win. no surprise there.

i think burridge has a better chance, slightly, and watson says that tsurenko has a better chance. i guess we'll see. now, sports like lawn tennis can seem like they're mainly aimed at older spectators, which, of course, is nonsense. look at me, for example. but wimbledon has always tried to engage with younger audiences, and this year, that means putting it in roblox. this is the first time that centre court has been built for digital tennis on the platform, which means its 5a million daily active users can knock up on the world—famous grass. nearly half of roblox users are under the age of 13, so this could catch young minds. let's create my avatar. meanwhile, if you can't get one of the prized courtside seats, or even if you can't be here in person, you can still wander round wimbledon�*s famous hill on the official website. choose my blanket design. fine. visitors can complete daily challenges while they learn

more about the tournament. i'm wandering around now. refreshing drinks are not included, sadly. and i have to say that wimbledon�*s digital fans do appear slightly odder than their real—life ones. there's someone there with an ice cream on their head. right, so, earlier, i used the app to make a match prediction, and so did ibm's ai watson, and the results are now in, and... ah. well, i hope i didn'tjinx it, but tsurenkojust beat burridge 6—2, 6—3. which means that prediction i made earlier... yeah. watson is currently beating me one—love. and throughout the fortnight, that al should get even smarter because it's going to be reading all of the discussions and the media coverage about injuries, players' health and their general performance, and that means we can do something quite exciting. now, i'm filming this quite early in the wimbledon fortnight, but we're putting the finishing touches to this programmejust before the singles semifinals, and that means that we can put on screen for you who watson thinks is going to

win those matches. i've got no idea what you're looking at now, but by the time you watch this, you will know how it did. now, some might find apps like this a bit gimmicky, but if they can get fans of all ages engaging with tennis, well, that can only be a good thing in my book. but let's change sport completely now, because omar mehtab has been competing in a very different kind of tournament. numberfive, going fora kick| at the goal, but they lose full ball control, and - the second attempt... omar: every year, robot football teams from more than a0 countries compete in robocup, with different leagues for different types and sizes. and tries to pass to... tries to pass to... cheering this is tech united — home of msl, the five—time robocup champions from the eindhoven university of technology.

now, everyone knows how much of a football fan i am, so i can't wait to see how these little guys fare and also what kind of applications they can have outside of the sport. but first up, penalties. music: match of the day by barry stoller. 0h! oh—ho! oh, hey! i'm not saving with the left hand any more. argh! a mirror helps these robots to see the pitch in 360 degrees... ..with cameras for object and colour recognition. so they see where the field lines are. right. and then relative to that, you can see, for example, the yellow ball, you can see a robot and then calculate where, absolutely on the field, their position. wheels spin to pull in and hold

the ball while a magnetised lever can launch shots at ten metres per second. we can move it up and down to give a lob shot or move it all the way up to give a flat pass over the ground. is it the case that you preload a certain tactic based upon your opponent, or is it that these bots just completely make up whatever they want as soon as they get on the field? we do prescribe them what we think are good strategies, but at the time during a match, they determine themselves what they should do. but we're also looking into using machine learning to find faults in the play and before we actually go on to the real field. at what point do you think that they probably would be ready at some time to face humans competitively? so, hopefully, we can use these robots to win from the human world champion in football in 2050. not too far away, then! we're going to give it a go now, though. so i've flown in a couple

of people to help me out, namely paul carter. paul. i'm here, man. i'm here to save the day. cheering. nice to meet you. paul, nice to meet you. how are you doing? whistle blows. i think the odds i are in our favour. i think we'll manage this as we have some good talent on the pitch. the bots kick off with some swift striking. oh, my...! oh—ho! only the goalie differs in form compared to the rest of the bots, as it has extendable arms.

but it couldn't stop sharpshooter carter. the robots communicate with each other up to 60 times a second, working together to pull some questionable moves. whistle blows but between fresh batteries and...bananas, i learned this isn'tjust about man versus machine. robocup actually lays the foundations for serious collaborative robotics. integration of robots and humans within the same team remains limited nowadays. but if we look at the future, we will see more and more collaboration between robots and humans at team level. this type of set—up could allow us to develop techniques, methods, algorithms to make interaction meaningful. how difficult is it to transfer what they're doing as tasks into other robots from other industries? easier than you think!

really? yeah, i have a robot that needs to recognise balls on a field, and if i have a service robot, it needs to recognise faces in a home environment. they are both computer vision tasks and the methods that you use to address this task are more or less the same in two different contexts. the open source project has already helped inform this home health assistant, modifying with a handy gripper. paul laughs. tech united branded cola. and after some refuelling, i did eventually find the back of the net. but given how fluid these robots are getting, it's good to know, in homes, work or play, we'll be on the same side together soon enough. we did it. yeah, smashed it.

researchers in finland say this battery could crack how to store renewable energy loan term. the special ingredient is sand, storing heat warming peoples homes in winter. if we have some _ peoples homes in winter. if we have some stations _ peoples homes in winter. if we have some stations that - peoples homes in winter. if we have some stations that were i have some stations that were just there for a few hours and weeks in the wintertime, it will be extremely expensive. we have solutions providing flexibility for the storage of hate, that would help a lot. ukrainian tech start—up has started its metaverse

educational platform despite having to move out of the country. they will use the platform as a virtual classroom offering training in tech skills. silicon valley firm mojo vision says it has completed the first successful on our demonstration of a smart contact lens. the prototype contains a micro led display that the wearer controls with eye movement but the biggest challenges making sure the power and communication work wirelessly when it is actually on an eye. lara: several years back, i tested what were then four of the leading activity trackers. even though i'm wearing them all, all the time, they don't have the same view of how many footsteps i've taken. so i decided it was time to put

some of the latest devices to the test to see how they fare. i have the apple series 7 watch, the fitbit sense, and the oura third—generation ring. i'm going to focus on steps, sleep and calories. but of course, devices can do so much more now — measuring heart rate, temperature, taking ecgs and judging how stressed or ready for the day they think we are. i thought the smart watches were going to feel bulky but i've slept really well. it is too early for me to think too much about the data but already throughout the day to day there has been waited difference that the apple watch and fit but think i've done stopping the apple which thinks they have done fewer and this does seem to be a theme for people who wear both the devices so let's see how it plays out throughout the week. i knew my husband's fitbit was counting too many steps.

it's day three now and i'd like to talk about sleep. the oura ring seems to think that i've had a similar amount of sleep to the fitbit, just about a ten or is—minute difference. but the apple watch thinks i've had nearly an hour less, so there is quite a substantial difference in count there. similarly, the oura ring thinks that i've done the same amount of activity as the fitbit. it's the apple watch that thinks that i've been a bit lazier. all three of the devices break down your sleep quality. the fitbit�*s timing and scoring on deep and rem sleep, as well as your level of restoration, were really clearly presented. but the oura took this to another level, warning me to pay attention and adding a sleep score. apple tracks all of this too, but digging out the data retrospectively did feel more effort. it's day five now and i definitely feel like i need to do more activity than usual because you're watching! but the results do seem a little bit more consistent between devices than the last

time i did this experiment about seven years ago. i've put all my data so far on a spreadsheet, so i'm really able to compare them, and the thing which is particularly similar is the number of calories burned. really, the differences between them on each device is pretty negligible, even if sleep and steps do vary a little bit more. and one thing i'm rather enjoying is the readiness score that the oura ring gives me. it's based on all of that data and effectively just tells you how much energy you're likely to have, but it seems pretty realistic. and by the end of the week, the data told the story that sensors have improved over the years, as have the algorithms. seven years back, there was a difference of 3,000 calories between devices at the end of the week. here, the difference was more of a bowl of cereal rather than a whole packet of it, and i am assuming that if they all say something similar that that is pretty accurate. overall, the fitbit counted around 4% more steps than the apple watch.

and the oura ring, another i% to 2% on top of that. the sleep data had varied between devices. adding it all up over the course of a week, there was a two hour, 17 minute discrepancy between the fitbit and the oura, with apple somewhere in between. the fitbit sense's electrodermal sensor is checking for even the tiniest bit of a sweaty palm to provide data that contributes to a daily stress score. it correctly — yes, correctly! — found me to be very calm. meanwhile, the apple watch is keen to tell me every time that i need to breathe when i may knowingly feel a little bit flustered. this time around, i've come away from the experiment feeling a little bit different. instead of it being a question of "are they accurate or not?", it's more a matter of "which device would you rather wear?" it's definitely easy to track your sleep in a ring, whereas if you want to see your data throughout the day, well, i personally like to be able to look at my wrist rather

than my phone for it. the apple watch, well, it's a perfect player in the prism that is the apple ecosystem, so if you use apple, well, it fits very well with that. but i can't really knock the interface on the fitbit. but not all wearable trackers are where you think they'd be. more later for those who want some more in—depth analysis on their steps and their step. but for now, here's paul, who's been exploring body tracking for everyone. paul: beyond wristbands and wearables, artificial. intelligence is often now used to also help athletes understand and improve their game. and in london, one start—up has developed a smartphone app to make this kind of training more inclusive. can you tell me a little bit about what teamsportz is and what it is that you do? i grew up playing basketball in a very deprived environment, so i build a technology for anywhere else in the world where you might have very limited access to technology.

training is for individuals and teams, using artificial intelligence to detect disabled and non—disabled users. where are your arms or your legs, and where is your torso? and if you don't have the arms or the legs or the movement on those limbs or whatever it might be, the model will still be able to render a human body. movements are then interpreted as activities like squats or push—ups. you don't suffer from the same bias that al often brings. so i guess the big question is, do you reckon the system will be able to track me? i'm confident that it will. look at that. it's got me. yeah. i didn't think it would. helpfully, the app can link to a big screen. so those targets will appear randomly, so you can't guess where they are. so you actually have to exercise. i wish i could. i am so unfit. the skeleton overlay, over your body, that's the ai model. i don't think it's having to work too hard to know i'm

going not very fast at the minute. rep counts, speeds and scores can be shared to gamify the experience, with new possibilities for schools too. for the first time, they can give homework to kids to do it at home. kids across the country are going to love you! they laugh. wheelchair user karina has been testing the app in exercise sessions with disability sports uk. cheering. a music lover, karina certainly has the moves, though i'm not sure we agreed on everything. laughter. coach emma's classes combine all kinds of movement, dance and ball activities with this new technology, and settings can be adjusted to suit each person's motor or cognitive needs. a lot of members, when they first come, are quite in their shell and not very confident,

but using that technology, we could see even playing it or having a go at it a couple of times, actually how it improved. and with hopes for this to roll out to more clubs and members at home, it's notjust about bringing physical games. honestly, different things like this, that our members get a chance to have a go at, really makes a big difference tojust their overall outlook and their belief in what they can achieve. everyone needs that human connection as well. you've got a mixture of both that i think... that's... yeah, that's the ideal. technologies like the ones seen today aren't the answer for everyone, but for disabled people who traditionally have been excluded from access to sports and fitness, the benefits are obvious. if it can get me off the sofa, it's doing something right! and the class does seem to think so too. we want more of this one day, i hope. - when you try hard, i you can keep getting

better, better, better. lara: lovely to see everyone getting involved. meanwhile... now, i'm a keen runner, but i'm not particularly good orfast, although i have been running about 5k five or six times a week for the last two decades. the issue is, though, if anybody runs with me, they do say that i run like an elephant. the question is, is it true? these nurvv running insoles aim to prevent injury and improve performance by tracking how your feet touch down. with 32 sensors, your power, step length, pronation — that's the way your foot rolls inwards — training load and more are being measured. any runner knows the importance of wearing the right trainers, so i always wear ones for over—pronation because that's what i was told i needed, and i thought that they'd level things out.

but it seems that i'm still a bit wonky. the app confirmed, if not overstated, how absolutely awful my balance and foot—roll are, whereas it suggested my cadence — the number of steps i take per minute — is a lot better. the app also provides real—time data through your phone or a smartwatch, and i discovered that when i'm running outside, i'm always in the challenging or extreme zone, whereas i'm never close to that on the treadmill. so i guess i've discovered that i need to work a bit harder indoors. i was more interested in the post—exercise data, though, but can i really change the way i run? like other foot—worn running trackers out there, the data is useful, and these ones were surprisingly comfortable to wear, and the results do come with some tips for better running and fewer injuries. but when it comes to improving style, even when making a concerted effort, the moment i get evenjust a little bit weary, the elephant is back

in the room, or on the running track, straight away. can ijust say, doesn't run like an elephant. that's not what an elephant running looks like. no, but it's not about what it looks like. it's the risk of injury. if you don't run properly, you're going to hurt yourself. i see, right. meanwhile, iavoid running injuries by not running. shall we leave it there? yes. that's it from wimbledon. thanks for watching. we'll be back next week. bye. bye— bye. hello. very little rain in this forecast — but there is heat to talk about. and in fact, as temperatures head up during sunday,

parts of wales, the wider area of england, begin three consecutive days with temperatures in the mid—to—upper 20s, some spots low 30s, which will qualify it as a heat wave right underneath this area of high pressure. there will be cloud to begin with, though, misty low cloud into northern ireland, western scotland, parts of north west england, north wales. a lot of that's going to disappear and mayjust linger around some irish sea coasts, far north—west scotland staying cloudy, in the northern isles, rain clearing away from shetland. for many, though, it'sjust a case of plenty of sunshine, mid—to—low 20s, the warmest parts of northern ireland through eastern scotland, mid—to—high 20s, much of wales and england, 30 in south east england, somewhat cooling sea breezes around the coasts. it's going to be a hot one on centre court — and notjust wimbledon players and spectators will need to protect against the strong sunshine with high, or indeed, very high uv levels. sunday evening, well, stays fine, very warm, bit of misty low cloud returning towards north—west scotland and maybe still around some irish sea coasts going into monday morning. overnight temperatures mid—to—low teens, but the nights are getting a bit warmer, as well. then during monday, there will be a bit more cloud

filtering into scotland and northern ireland, though it will still feel very warm with some sunny spells. an increasing breeze and some rain, some rain heading into the western isles later in the day. for wales and england the sun will turn hazy, but it will still be there and it'll feel hotter. more places getting to that 30 or above celsius mark. and then, going into tuesday, there's a cold front that's moving its way southwards, but it will have barely any rain once it moves through scotland and northern ireland, and it willjust be a band of cloud, really. so behind it for scotland and northern ireland, feeling fresher on tuesday, some sunny spells the chance of a shower. although there will be some cloud filtering through wales and england, it will still feel very warm or indeed hot in places, and in fact could well be a hotter day still on tuesday in south east england into the low 30s before then. just turns a touch cooler going into wednesday. in fact, for the rest of the week, scotland and northern ireland temperatures in some spots

below average for the time of year. it will stay very warm across southern areas, and there is the potential for another burst of heat, maybe extreme heat, into next weekend, which we are watching.

this is bbc world news. i'm gareth barlow. our top stories: sri lanka's president, gotabaya rajapaksa, will step down after protesters stormed the palace and set fire to the prime minister's house. we report from the scene in colombo. these protesters, they want a new beginning for sri lanka, a new political culture so they will not face a similar economic crisis in the country. voting is under way injapan�*s parliamentary elections, just two days after former prime minister shinzo abe was assassinated while on the campaign trail. uk chancellor nadim zahawi has added his name to the conservative leadership contest, joining a field of eight including sajid javid and jeremy hunt.