this is bbc news, the headlines. questions surround the future of the uk's high—speed hs2 rail line. speaking to the bbc, senior cabinet minister grant shapps says it would be "crazy" not to review the project amid rising costs and inflation. the fate of ethnic armenians in disputed nagorno karabakh is hanging in the balance as their leaders say most will likely leave their historic homeland — now controlled by azerbaijan. thousands are without food or shelter — and only one aid delivery of 70 tonnes of food has been allowed through. nasa awaits the return of a space capsule carrying dust samples from what's described as the most dangerous rock in the solar system. scientists hope the osiris—rex samples from the osisemission could reveal new information about the formation of the planets. and in the uk — a review into police carrying weapons. the home secretary says armed police must not fear "ending up in the dock for carrying out their duties."

the report suggests more than a hundred met officers have now on bbc news, click. spencer kelly: this week, nick looks at meta's latest project to help people make sense of the horrors of the past. this is more than bringing back a dead person. this way, you can make that person... ..give them a thousand years of life. lara lewington: can smartphone apps really provide _ an effective alternative to hormonal contraception? it tells you when you're not fertile and when you're fertile. _ and open wide... alasdair, we'll take

you through now. ..alasdair�*s taken a trip to the dentist to look at a device that may help prevent... ..well, further trips to the dentist. i think there's a misconception that once decay starts, - it has to end up in a cavity. but if we can identify. at that early white spot, then we can start to get the tooth to reform. - in the centre of london, there is a building like no other — an empty space where the public can sit, relax and look up. i have to say, of all the giant led screens i've seen in my time, this one's right up there. i mean, it's literally right up there. well, yes, and it seems like it goes on and on and on. yeah. and it also makes you feel rather dizzy looking at it. they laugh. this is outernet, the largest digital exhibition space in europe. here, an array of artists' work is displayed in its full panoramic glory.

aside from the huge cube that spun laura out... you were 0k in the end, weren't you? i was. good. there are a few other spaces dotted around, too, which are used to showcase specific exhibits. this room celebrates the role that women from all backgrounds have played in shaping the creative industries. and it's just one example of immersive technology bringing us closer to the events of today and the past. but some events are hard to face, even though it's important to do so. and one of the most important is the holocaust. it's now been many decades since its horrors took place, and as time goes on, fewer survivors are around to be able to tell their stories. for a while now, researchers have been documenting them digitally so their legacy can live on for future generations. and, of course, there are now new ways to breathe new life into those memories. and nick kwek has been to meta in berlin to find out more. nick: a stone's throw from the memorial to the murdered jews of europe, i've come to meta's

offices to try its latest extended reality project. i'm the first journalist from outside germany to see the new interactive holocaust education tool. tell me, inge takes users on an audiovisual journey into the memories of inge auerbacher, a survivor of the nazi regime. you ask inge questions by simply talking, and the artificially intelligent system will play out her response. tell me about the terrible journey. inge: one morningl when i was seven... it's a real recorded answer, not a digitally doctored version. 0h, inge's showing me something. she's opened up a box. but it's presented to you like you're inside a video game, a moving storybook, with your environment changing around you, as inge recounts more anecdotes and details from her past. that's pretty cool. so she's opened a book and then we can see, floating up over her right—hand shoulder, the book. it's a joint project with hollywood start—up storyfile,

which is now moving beyond computer screens and is stepping into uncharted virtual territory. it's a little bit tense in this space, i have to say. it feels...a bit eerie. i feel quite nervous about it all. my hands are sweating a bit, but it also is great to kind of see her stories come to life in this way. it makes you focus more on what she's saying. in a strange way, you're almost being entertained. the experience was made in partnership with unesco, claims conference and world jewish congress. you can take the story wherever you want to take the story. you can ask for it in whatever order you want to ask. i mean, you can't really ask for something more engaging at this point than that. you know, we used to sit in...you know, in memorial museums and kind of read the texts and be told some of the stories behind them.

but this is a completely different level. there are two nazi guards... ..at the gate. ..almost touch it. so far away — there was absolutely almost no chance to get out. it's really sad. well... is there a fine line, though, when it comes to designing an experience, where you want to make it engaging but maybe not too immersive? you shouldn't overwhelm someone emotionally. and i think, especially because of this, we decided to use sd animations that make things real, but it's not realistic. and so you get a sense of what was going on. and, of course, you hear from inge first—hand, but still, you know, there's some sort of a distance because it's not like that you see real soldiers, not like you see real people getting hurt, and so on and so on.

but you understand how the scenery was looking like. i've been working on genocide and holocaust commemoration issues for many years. these topics are not easy. the immersive part of it really makes you also feel like you're part of the life of the people. and seeing inge, where she is today, and seeing that there is a life for survivors and how she made a life for herself and how strong she is, is also part of, you know, the positive part of experiencing this. thanks so much forjoining us. it's a real pleasure to meet you. have you got to try the experience yourself? have you seen what you look like... yeah. ..in virtual reality? yeah, ilook... yes, i look pretty good. i was satisfied. she laughs. when you read a book, sometimes you would like to speak to that person in the book, to converse with that person. but you can't. you have to continue reading. and i think, this way, this

new method gives you this insight. unfortunately, you can't ask inge any old question. it has to be in some way connected to answers that she originally recorded. but what's really clever here is how the application expands once you get to know inge more. her grandad's just popped up there. as your curiosity piques i and you come back to inge after the first story has been told, you find there's a sequel to that, i some follow—up that you can then ask iabout, which then takes you on thisl journey and these branches through her life. _ and that's how we structured this, not as a linear storytelling — - we're not watching a movie. we are actually delving. into her life and allowing, just as we would do in conversation, different aspects of that life - to unfold as we talk to her. right now, you can only hear from inge in english and german, but down the line, stephen says, using ai, she could be translated into various languages so everyone can access it.

what was the experience like, being in the studio, being asked all these questions? i don't know. i'm a talker. i don't mind answering anything because when i'm gone, i'm gone. it's finished. history is gone. this is more than bringing back a dead person, you know, because that's not possible. but this way you can make that person... give them a thousand years of life. i think that's wonderful. lara: over the years, we've covered the highs and the lows... _ spencer: a lot of lows. ..of cryptocurrencies. yeah, there are plenty of people who still hope that these unregulated digital currencies will replace traditional payments for goods and services. but the reality is you still can't buy much with crypto, which leaves it mainly as a high—risk investment. yes, crypto assets are notoriously volatile in value. get this — according to one report, hackers have already got their hands on $200 million this year alone.

so if you do hold crypto assets, what can you do to reduce those risks? cyber correspondent joe tidy has been taking a look at crypto wallets. joe: it's estimated there could be as many as 400 million people around the world who hold cryptocurrency. but it's thought a tiny fraction, around 8 million, are securing their coins offline to protect from crypto hackers or companies collapsing. remember ftx? it's been nearly a year since that imploded, and still a million people are missing their coins. the safest way to protect your crypto is with a hardware wallet, which is, oddly, a physical device. so let's see for ourselves, then. just how hard is it to take bitcoin from an exchange and put it onto a hardware wallet, like this?

the idea of a hardware wallet is very simple. it holds the private keys to your digital wallet, making you your own bank, just as crypto's inventors envisaged. with the key stored safely off the internet on a physical device, your coins are safe. i've got hold of one of the most popular ones to test it out. so, i've got to go to the trezor website, and i've got to download their software. you've got to make sure, of course, that you put in the right web address, because this will be a prime—time... i imagine that hackers and scammers will want to get you to go on their fake trezor website or fake ledger website and hand over your bitcoin by mistake. then, you have to plug in cables and install some firmware. so far, so good. ok, so now it's telling me that i need to create a backup for my crypto wallet, and it's giving me some randomly generated words which are my seed phrase, and, weirdly, it's asking me to write them down.

this so—called "seed phrase" allows me a way back to my currency if i lose or break the hardware. so this feels like a really analogue way of securing my crypto. i've got this hardware wallet, which i've obviously... you know, they cost money, a lot of money, but then they've just given me a pen and paper. now is the potentially tricky bit. i need to somehow get my coins from the exchange... in this case, binance, one of the most popular in the world. ..onto this wallet. i had a feeling this would be where it gets tricky. how do you get your money off the exchange? ok, so i've got a qr code now for my new wallet, so i'm going to scan that with the app. invalid. right. ok, so, what do i do now? after a bit of good, old—fashioned online troubleshooting, we're in. it's a bit worrying, this moment, because, of course, i've had this cryptocurrency for years and years.

there's not much there, butjust sort of trusting the process. so, here we go. i'm going to click on withdraw. just have to wait. i hope it worked. now, that was stressful and complicated, but i'm now my own crypto bank. no—one has access to my little stash apart from me, but it's also a lot of pressure. it's just such a different experience from internet banking, for example, where, you know, you send money from one person to the next, then it keeps you informed of...you know, of all the process, but it's not intuitive at all. i can see why the process is daunting to the vast majority out there, choosing to take the easier route and just hope that their coins stay safe online. as is always the case with crypto, it's a gamble.

elon musk hinted that a payment system was the only way to tackle box. the bbc approached the company for comment but has not received a response. the us national accelerator lab has created the world's most powerful laser. it will allow scientists to examine the details of quantum materials and study how biological molecules can create new drugs. it can freeze frame the motion of the molecules and watch how they interact with each other, how chemical bonds are made and broken and how the system involves after that. 0range marine has launched a new cable ship which is set to be its most advanced yet. the ship repairs submarine cables in the mediterranean, red sea and black sea.

the vast majority of the world telecom communications pass through these cables which crisscross the sea bed. and finally the i0s 17 update. the latest apple operating system upgrade has made improvements to auto correct, live voice mail will transcribe a caller's message in real time and you can record a video message when somebody misses your facetime call. spencer: now, there's been a recent explosion of misinformation on social media, encouraging women to ditch hormonal contraception, due to fears about side effects. and influencers are promoting the use of apps to prevent pregnancy instead. lara: investigative journalist - katie mcevinney has been meeting women who've used these apps, with a very mixed bag of results. let's take control of our fertility. katie: so—called natural alternatives to hormonal contraception are everywhere on social media, from the fertility awareness method to period—tracking apps.

this is my birth control. 0ne popular app is called natural cycles. with 2.5 million registered users, it sells itself as digital contraception. the company behind it says it's "93% effective with typical use". the same, they say, as the pill. camera clicks. and influencers advertise it a lot. this is my app. 0k. foramelia, it's worked for five years. she tracks her fertility by measuring her temperature. you press the button. thermometer beeps. so you just put it under your tongue, and you wait for it to beep. thermometer beeps. like that. and it'll tell you what your temperature is. so you put in your temperature for the day. if you're sick, it could change your temperature, obviously, like, if you didn't sleep very well, or if you're hung over. then, it kind of like discounts your temperature for that day. that's something that i would really worry about. yeah. like, if you have a long lie

or you're hung over, it would affect how accurate it is. yeah, which it definitely does. so it, like, rules out that whole temperature for that day. it tells you when you're not fertile and when you're fertile. so, when it says "not fertile", it's safe to have unprotected sex. but if it changes to red, that means you need to be more careful and use a condom if you're having sex. it's made a big difference, in that i'm not relying on a hormonal pill every day that could mess with my mood. it does take a lot of work on your part to get used to taking your temperature and putting it in the app. it works for amelia, but does it work for everyone? say hi. meet penelope, matilda's much—loved but very unexpected baby girl. boo. matilda tried the pill, the injection and the coil, but none of them suited her. i went back to the doctor's, and within, like, a couple of weeks, i felt back to myself again,

but was, of course, like, suffering with my periods still. i didn't want to go on any hormonal contraception. i don't feel like anything's suited me. i've been doing this for, like, eight years at this point, from, like, 12 to 20, where i'm either bleeding all the time or not bleeding or suffering and in pain, and theyjust kind of turned around and said that there wasn't really anything that you could do to help with that. at this point, i'm, like, 22, in a relationship, but by no means at a point where i'm ready to, like, try for a baby or have a family. she says she found natural cycles advertised on social media, and followed the apps instructions immediately. ijust saw it. i think, green and red, most people think, if you're sat at a traffic light, red means stop, green means go. i assumed the fact that i'd entered my data meant that they knew enough about my body and my cycle that i could be having unprotected sex. i had been using it from the december, and by the january, i'd found out that i was pregnant. itjust wasn't something i think i was quite ready for at the age i was, maybe.

obviously, i've come to terms with it, and i love it now, but it was definitely a massive shock. natural cycles says the app is effective from day one, and that it "will only give you green days "when it has enough data to do so." i think "effective from day one" is, like, a very bold statement to make. i think the app putting something forward that, after six months, you can be having a happy and hormone—free life, that would be a better statement to make than saying it's effective from day one. but that was definitely what attracted me to the app in the first place. it's been such a challenge, but obviously one of the best things ever. she's been brilliant. for someone who, maybe, getting pregnant today- wasn't quite the plan, but if it happened, it. |would still be a happy surprise, | then methods that are a bit less effective, like the period apps, can be great for them. -

but for somebody who really doesn't want to be pregnant, _ actually ditching, potentially, a very effective method - of contraception for an app that requires a lot of user input - and might be less effective... ..is really worrying. natural cycles told us that no method of contraception is 100% effective, even when used perfectly. in a statement, it said... "less thani in 100 women become pregnant "due to the algorithm assigning a green day "when a user is fertile. "and the methods real—life effectiveness "is the same as its published rates." 0k, we're going to stay with health now. what is one thing that we should all do quite regularly but which most people don't enjoy doing? go to the dentist. yes. what is the thing the dentist tells me to do more of every time i go? flossing? and what do i then not do

for the next six months? flossing? correct. and for anybody who doesn't do their flossing properly, like him, well, a new device that alasdair keane has been to find out about could come to the rescue. it aims to identify decay before it causes a problem. have you got something stuck in your teeth there? mm—hm. alasdair: we've all been here — the long wait to see the dentist. alasdair, we'll take you through now. not always people's favourite place to be. thankfully, i'm not here for treatment, but to see the latest tech that could revolutionise detection of decay and allow changes to be made before it gets so bad you need a filling. so this is the new calcivis technology that we're talking about. basically, it's a specialised intraoral camera that's capable of actually visualising tooth decay, really, as it's happening, live. so it uses bioluminescence to be able to see calcium ions coming off a tooth surface, which is a marker of active disease. the inspiration for that process started somewhere unusual — deep in the sea, and bioluminescence

in fish. it's a completely new form of dental imaging. if you think about radiographs, for example, x—ray, that's about giving you a snapshot of damage that's already happened to a tooth's surface. now, what our technology does is it allows you to see whether that decay is happening on the day that you're looking at that tooth surface. so it's giving you information about what's going to happen in the future, rather thanjust what's happened in the past. because of that, this device can identify the decay at such an early stage it's possible to reverse it with cleaning, meaning you won't have to go under the drill. so, in here, we have a syringe that holds the photoprotein, which is the active component that gives off light when it comes into contact with calcium on the tooth. and as it's being applied to the tooth, there's a camera. yes. so, at the end here, there's a camera. it can give you a live video feed while you're positioning and then capture the still images when the photoprotein�*s applied. you've got some fake teeth somewhere that we can have a go with. so, at the moment, you're

getting a live video feed showing on the computer, and that's used just for positioning, to make sure you're getting the tooth centred in the image. when you press the button... device clicks. ..you'll hear a click. that's the photoprotein being applied to the tooth, and you get an image of the light coming from the photoprotein, showing where there is tooth decay. so look at this one here. this is low—level caries. so the light blue in here is showing where there's calcium ions coming from this fissure pattern. and this is the kind of level that we're really aiming at detecting. so this is where you could do something about it. you could reverse this process and prevent this becoming a cavity. back in the dental surgery, and dentists like leanne can see the impact this device could have on dental care. i think there's a misconception that, once decay starts, it has to end up in a cavity, and it's not always a big gaping hole. it starts with a small white lesion on the tooth, and then it will progress to brown, and then eventually, because it forms from the inside out, it will start to cavitate in.

and that's, most of the time, when the patient becomes aware. but if we can identify at that early white spot, then we can start to get the tooth to reform and to rebuild. but leanne and dentists in other parts of the world will have to wait a little longer for this tech. the company are going to launch in america first, early next year. we'd really like to see it. become standard of care. the move from the drill—fill. paradigm, through to a more preventive approach to dentistry is... - i mean, it's ongoing, _ and we think our technology is part of enabling that move _ towards a more preventive dentistry. lots of people are nervous about going to the dentist. what would you say to someone that maybe is quite nervous about this tech? i think it's about the overall - environment, the overall treatment environment and the way that the practice - sets themselves up. because if the patient knows everything that the dentist l is trying to do for them is about avoiding - cutting into a tooth... you know, it's almost a sort of before and after. - "so here is a problem . that you have currently. "we're going to do the following.

"three months' time, . six months' time, we're going to follow up and we're going to show you that - we've essentially turned off that activity. " - with that reassurance, i couldn't resist the chance to get my own teeth checked out. they were fine, but i probably should remember to floss more. that was alasdair, and that's it from 0uternet. yeah. thanks for watching, and we will see you soon. bye. hello there. some wet and very windy weather is developing at the moment. it is set to move into the north west of the uk. now it's for western scotland that will see the largest rainfall totals as we go through the rest of today and overnight with 30 to 50 millimetres, double that over the high ground, and that could be enough to cause

some flooding issues. and then as this rapidly developing area of low pressure continues to form and move quickly to the north west of scotland, where we could have some very strong gusts of wind developing as well. now, this afternoon, we've got some rain around, some increasingly gusty winds for northern ireland, wet weather for northern england and scotland with another band of rain set to move into wales and western england towards the end of the afternoon, early evening time. well, that still leaves central and eastern areas with dry and bright conditions, and it will be a mild afternoon for all. now, overnight tonight could see some very strong winds for the hebrides, the highlands, with gusts potentially reaching 60 to 70 miles an hour, maybe even a bit stronger than that. and as well as those potentially very strong gusts of wind, we're looking at heavy rain moving northwards and eastwards across scotland. band of rain moves across england and wales, but by the time it reaches eastern areas, well, it won't be too heavy at all. but it will be quite gusty for a time for many of you. and our temperatures overnight, 12 to 15 degrees. so a mild night and a mild start to the day on monday. monday is the day more or less

of sunshine and showers. the most frequent and heaviest of the showers will be across northern and western areas. a lot of dry weather for wales, the midlands, east anglia and southern counties of england. temperatures above average, ranging from 17 to 22 degrees. heading into tuesday's forecast, we've got a couple of weather systems kind of merging and ganging up on the uk. and so i think tuesday, an unsettled day. rain at times probably best sums up the weather. the rain could be quite heavy with some rumbles of thunder mixed in with it, maybe turning a bit brighter through the afternoon in northern ireland. but still the risk of some heavy showers. still mild for the time of year, 16 to 22 degrees celsius. for the middle part of the week, potentially disruptive weather on the way. a deep area of low pressure moves into the uk. this bringing heavy rain and some very strong gusts of wind. inland gusts reaching 50 to 60 miles an hour, potentially quite widely. but around some of our irish sea coasts, we could see gusts getting up to between 65 and 80 miles an hour. so we're talking about potentially damaging disruptive gusts of wind

towards the middle part of the week.

live from london. this is bbc news injust under an hour, a nasa probe carrying asteroid dust that could reveal new details about how the planets were formed will return to earth. iam i am live here in utah where, less than an hour, we will see a capsule carrying these precious samples from asteroid bennu landing in the desert. the uk home secretary orders a review of armed policing — after dozens of officers withdraw from firearms duties after an officer is charged with murder. uncertainty surrounds the future of the uk's high speed hs2 rail line — the defence secretary says it would be "crazy" not to review the project amid rising costs.