and that is certainly what we're doing with the indians. people in england may not need to self—isolate if they have been in close contact with someone with covid. daily rapid covid tests will be offered as an alternative to ten days quarantine. if they test positive, then they're required to isolate, and they have to take a confirmatory pcr test. so, again, it's a really important time for us to collect these data. so, hopefully, this may be more of a normal situation, so that we can move away from this very, very costly, long isolation. a national day of mourning in israel, after 45 people were killed a crush at a jewish festival early on friday. north korea has accused president biden of pursuing a hostile policy towards it, and has warned that the united states will get hurt if it provokes pyongyang. nasa's first night—time splashdown since apollo 8. four astronauts have returned to earth from the international space station.

now on bbc news, it's time for click. this week: how to uncover deadly secrets online. the secret codes attracting more women into cybersecurity. and — tenet, the oscar—winning secrets of making time go backwards. audio tracks backwards. welcome to click. we all know how easy

it is to fake things online these days — not even photos, voices or videos are safe, as we well know, right? yes, we've worn fake clothes, we have faked our voices with software. i've even been entirely faked with a virtual me — although i am convinced that she looked ten years older. i whole—heartedly agree. later in the programme, we're going to see the hollywood version of this, when we look behind the scenes at the film tenet. spoiler alert — it wasn't all real. but these days, you don't need a big budget to do this. just think of those zoom backgrounds that we've all been looking at. admittedly, the edges of your hair do often give the game away, but these pictures are pretty good, a lot better than we would have imagined they could be five years ago. harp glissando. so, check out the next advancements. this is where zoom can put meeting participants into a meeting room — a real one that's not real, although i think something has gone wrong with the sizing here, don't you! my seat�*s way too low

and you're far too small. there's a variety of scenes. do you want to meet me for a coffee? look, here we are in a coffee shop. yeah! i will have a latte, please. i'd say this is cute, but does it make you feel like we're in the same room, really? no, i still feel like we're on a zoom call. maybe this is one for the audience, rather than the participants. but while there is plenty of fakery around, the truth is out there, as a certain fox once said, and there are some the internet is just such a vast place, and like there's so much out there that's just public, so many ways that information can be manipulated. and even, like, political news can be manipulated in someone's favour, so that is where i think open source intelligence is useful. 18—year—old computer science student kenyon lee has gone viral on tiktok by using so—called open source intelligence, collecting and analysing publicly available data. his main trick...

he guesses people's exact height by finding other objects in the same shot and tracking down their exact dimensions. woman: how tall is spencer? now, kenyon did do this test on a video of me that he found online and we'll come back to that later. mainly on account of it being the most embarrassing video i've ever posted online. but we have some serious stuff to talk about first. but trust me on this. there are groups of people out there who are using open source intelligence techniques to do much more serious detective work. these are anatoliy chepiga and alexander mishkin, widely believed to have been responsible for the salisbury poisonings in 2018. this week, a collective of open source intelligence investigators revealed they'd also managed to link these two men to the bombing of a czech ammunition depot four years previously. that collective is bellingcat, and we've met its founder, eliot higgins, before. in 2014, it was just him,

but now he has a foundation in the netherlands, 20 staff members, and a growing network of volunteers all across the world. i caught up with eliot again recently and he told me that flight logs of chepiga and mishkin's trip to the uk in 2018 were revealed by a russian news site, and that showed that their passport numbers were only a few digits apart, which was to say the least, unusual. that caught the interest of bellingcat, in particular our investigator christo grozev. so, christo looked at these databases and discovered these two individuals didn't exist before 2012. theyjust popped into existence in these databases in 2013, which was suspicious. he then approached basically an information broker who sold him these domestic passport registration documents, and stamped on them was the number of the russian ministry of defence. and it became clear they were not ordinary people, that these appeared to be russian intelligence officers.

bellingcat�*s investigation didn't end there. their evidence showed that scientists linked to the 2018 poisonings were following russian opposition leader, alexei navalny on a0 separate trips in 2020. that includes the journey where he was poisoned. it seems what we've stumbled on with the skripal story, is this entire kind of network of russian assassinations using nerve agents. and that sounds completely insane, but, you know, we have the receipts, we have the phone records. we have everything that shows this is happening. and this is basically unique to russia because russia has this kind of massive amount of corruption where data, phone records, even if they're spies�* are freely available to anyone who does a bit of googling. what tools or software do you and your investigators use when you're looking at photographs and trying to work out where they've been taken and when you are tracking information back

across the internet? we have an online tool box, which is basically loads of links by category that anyone can go and look at and use them themselves. probably one of the most powerful tools is google, google earth, google streetview. they are extremely useful in open source investigations. resources now allow you to track aircraft, like flightradar, marine traffic allowing you to track vessels. photos and videos can now very convincingly be doctored, does that cause you a problem, or is that a new investigative stream for you 7 yeah, you have this concern about deep fakes and there is concern on immediate social media reactions about things being shared and retweeted. we approach stuff as evidence, so when we look at that kind of thing, we say, "ok, here is a video of tom cruise "playing golf.

"can we find out the golf course?" or if someone is giving a speech, it is going to be from a longer piece of media. people don't give two minutes 20 seconds speeches. they are generally longer. so we look for that original footage. we look at the account who shared it. is it shared by an official news organisation? 0r newsfinder217. we look at the account behind it. has it been shared before and where has that stuff been? you look at the different dimensions of that video both what's inside the video and how it has been shared and propagated online. absolutely fascinating stuff. that was elliot higgins. i cannot put this off any longer. time to go back to kanyon lee. you remember him? the tiktok person. the problem is... the video he chose was my ice bucket challenge from years ago, which, if you have not seen, well, you are probably one of the lucky ones. i have seen it.

i can't un—see it. # ijust can't get enough of you.# i was trying to raise money for a good cause so i decided to go full outrageous and i kind of forgot that the internet never forgets. ok, here it comes. i decided to look at the ice bucket challenge. i overlapped these two frames and marked the top of his head and scaled his height. this translate to... that translates to 174.757 to centimetres. there was a point to all of this. did he get your height right? he said 174.75. let's have a look. oh, wow, 175! not bad, not bad at all. not bad considering he did

that from the dimensions of a bucket! yeah, good thing he didn't use a 3.5 inch floppy disk! hello, and welcome to the week in tech. it was the weak us ridehailing firm lyft was sold to toyota for $550 million. and tiktok said it would open a european transparency and accountability centre in ireland. the announcement followed concerns over how the chinese social media giant serves its young users. the first triple—drop drone hit the skies. this electric device can carry and deliver three separate loads — although it can only stay in the airfor a maximum of 90 minutes. two college engineers won an mit award for their invention. the grain weevil. this remote—controlled robot

helps farmers stay safe while it levels and distribute the crop. it can dig itself out of five feet of grain as well. and a! labour. this autonomous arm uses al to identify nearby apples, leaves and branches, all so it can plan the path for its pneumatic suction plucker. it can pick and deposit an apple in as few as seven seconds! how do you like them apples! this is the huawei 2, the third iteration of its folding phone and easily the best yet. this time they have changed the format. the folding screen is now protected inside the phone, when it's closed, which makes a lot of sense. it has been a pleasure over the last few years to be able to try out so many of these folding phones and see this new category of devices emerge and all the manufacturers have had

such different approaches. huawei's was always unusual because it wrapped the folding display outside the device, which looked cool, but it did leave the display vulnerable. this time they are taking a leaf out of samsung. they are putting the folding display on the inside of the phone were it is protected. there is a secondary display on the outside of the device. actually, they have taken a few leaves out of samsung's book this time. this is very similar to the galaxy z fold two. to the camera bump and the chunky hinge. i thought folding phones might be the end of every phone looking the same but here we are. it is a much better design. the screen snaps into place. and it doesn't leave a gap, which is a big improvement over samsung's design. this is the first one of these i'd feel comfortable enough to throw in my gym bag

like a regular telephone. another fantastic bit of engineering. when i first started using it, it felt really comfortable in my hand. i couldn't quite put my finger on why. i've always been very scared of dropping these folding phones because they are typically very expensive and fragile, but with this one, i neverfelt like i was going to drop it. itjust sat very comfortably in my hand and this is why, the phone is wedge shaped, which moves the centre of gravity closer into your right hand, so when you're holding it here, there is less weight over here. it weighs about 300g, which is more than a regular phone, but because of this, it doesn't feel like it. i also like the outside display because, when it is closed, it is a full—size regular phone with no compromise. you get pretty much the same experience as you would with a regular pro huawei smart phone, including the great camera array. as you would expect from a flagship

device. great stuff, that was chris fox. the secret services have always been... ..secret. but it seems that some things in the world in espionage are changing. m15 has just joined instagram. ina bid in a bid to move with the times. but other areas — in a bid to move with the times. emit other areas of cyber security haven't. for example, the number of women working in the field stands at just 16%. but a school's competition is hoping to change that. to see the role that women have taken over the years in cybersecurity, first i took a trip back in time to look at some pretty special computers and the coders that used them. i'm here at the national museum of computing on bletchley park, a place that's full of computers and memories, not least of the world war ii codebreaking.

today, it's largely associated with alan turing, who cracked the previously unbreakable german code. his efforts undoubtedly gave the allies the edge. 63% of those working out of bletchley park were in fact women, many of them working on the world famous colossus. thejob the job descriptions they gave to women codebreakers were different from thejob women codebreakers were different from the job descriptions they gave to men. i! from the “ob descriptions they gave to men. , ., from the “ob descriptions they gave to men. ,, ., ., ~' from the “ob descriptions they gave to men. i. ., from the “ob descriptions they gave to men. ., , to men. if you look at the paper records, women _ to men. if you look at the paper records, women will _ to men. if you look at the paper records, women will be - to men. if you look at the paper. records, women will be described to men. if you look at the paper- records, women will be described as twists— records, women will be described as typists and _ records, women will be described as typists and clerical staff. and that disguises what they were actually doing and this is because men were on a different pay scale so the code breakers had different job titles to women, who were on a different pay scale, but it did not tell you anything about the quality of

what they were doing. what should alan turing's legacy be? i've been writing a book that is trying to get away from the sepia—tinted view. of what he was and what he should stand for. he was always looking at the future, he was sort of like almost science—fiction and thinking about these amazing things like machine learning, which was obviously completely impossible in the late 1940s. but while many women were employed in code breaking then, the imbalance in numbers between men and women in cybersecurity today is huge. well, to help put things right, the national cybersecurity centre's cyberfirst girls competition is trying to find the next generation of female codebreakers. it involves solving puzzles i to do with coding and logic. cryptography, _ cybersecurity networking. and it's really fun. it promotes the idea that girls can code. it's officially competition day

and i am very excited. we will be giving the | teams some top tips. in the semifinals we could see the leaderboard, and i remember everyone was rushing to do more challenges. 12 and 13—year—old girls from across the uk have been competing in this year's challenge, which has moved online. you may think that's where it should be, anyway, but it is a collaborative and creative process. we need to succeed at our mission to keep the uk safe, to keep people who in the uk safe to work and live online. and we need all kinds of people to do that, just to represent the society we are working for, but also to get all of these different perspectives. and girls sometimes bring a different perspective. and some would argue that women have a real knack for it. women are good at linguistics, i which makes them irreplaceable at any natural language

processing services. . they are also very attentive to detail and good at - pattern recognition, _ and overall, patience, which are requirements for any science—related job. i with an abundance of all those qualities, this year's contenders are certainly feeling the pressure. having battled their way through ethical hacking, cryptography, decoding, logic tasks and much more. while waiting to find out who wins this year, i spoke to an ex—finalist, who's now studying cybersecurity at university. and because she's set on a career in the field afterwards, we had to keep her identity under wraps. i think definitely because it's computing, there is pressure to do well. i had to prove myself because i'm a girl, just initially a leap, and then i was hooked. you see all these women who are inspirational and you want to live up to them and you don't want to let all the other women down and you want to help

inspire the young people yourself. back to the competition, and the moment of truth is upon us. i really enjoyed the logic - and coding ones, but i also really enjoyed cybersecurity, because it required . you to think in different ways and use differentl methods of hacking into some websitesj it really makes you think of how easy it actually is to access other people's data and how important it is to keep your computer safe. i had to connect a circuit board, and then once i you covered your hand, it would start beeping. | we figured out those beeping noises were morse code, - like, dots and dashes, i and we wrote those down and found out what those were. in the cryptography section, if you ever need to send, like, a coded message to someone, i learnt a lot of different types of codes. i think a cybersecurityjob is now an option for me.

congratulations to the girls at highgate school! what an inspiring story! one of the few films i got to see the cinema last year was tenet, which, as a massive geek, i absolutely loved it. and you watched it twice. the second time, with subtitles, which i really recommend, because it helps you understand what on earth is going on. this is a film where half of the story is going forwards and half the story is going backwards, at the same time, in the same scene! maybe it is no surprise that it won the oscar for best visual effects? yeah, and if you did see it, and you wondered how they got cars crashing and buildings exploding in both directions at the same time, well, the answer may surprise you. inversion. aim it and and pull the trigger. you aren't shooting the bullet. you're catching it. whoa. doing visual effects i for a chris nolan film,

i imagine is different _ from the majority of big—budget hollywood films with l a lot of visual effects. because his approach is - very much about finding ways to film practical elements. wherever possible, we wanted to find ways of filming real - components and mixing it up a little bit so they felt very . real in the real world, - but still had that slightly odd of thing, it wasn't just a case of filming forwards scenes i and reversing them, l it was more than that. more interesting - and more complicated. a really good example - is when we have cars pulling away quickly and they are an inverted car, l you would expect the wheels to spin or throw some - gravel out backwards. what we did for those, - we found a way of dragging a car backwards while its - wheels were spinning forwards, so we threw dirt out - backwards, but it was going in the wrong direction. so we inverted the thing, all the way, sucking dust| back into the wheels.

that was a good example of the sort of approach i where we found a practical- real—world event and then just sort of turned it's on its head a little bit so it— felt real but wrong. you want to crash a plane? not from the air, don't be so dramatic. well, how big a plane? that part is a little dramatic. the plane crashing into- a building, talking to people since the film came out, everyone assumes that. that is largely cg, or must be, l components of that must be cg. but in reality, that i was actually achieved as a practical event, - where we used a full—size, real plane, and built a set. real plane, and built a set- and towed the planed into the set. and all of the pyro - explosions and everything is in the shot for real. there were visual effects involved in that we had l to clean out the tow. ropes and we added jet

blasts of the engines - and cgi trees to be burnt, but really the vast majority, the chunk, of that shot - was in camera, and so it is i kind of turning it on its head again a little bit in that people assume it is cg| or there are some major- components of it that are cg. but it isn't. the end scene in the film - contains a lot of big explosion events, and there are . combinations of forwards and backwards explosions. you can't train an explosion to be backwards. _ so we had to had one half of that shot. - whenever there is a combination of two things. — whenever there is a combination of two things. one _ whenever there is a combination of two things, one has _ whenever there is a combination of two things, one has been _ whenever there is a combination of two things, one has been added. i we certainly did that a lot for the minefield sequence and people in trucks . running up and down the hill and mines going off, - we used a combination- of practical shot elements, but also cg explosions, - which had to incidentally match exactly the practical ones - because they were right next to each other. another major event in the end

battle scene, where _ a building is simultaneously blown up by an inverted group— of people and a normal group of | people, so it is simultaneouslyl exploding and imploding. so, we built two large... or they were one—third scale ten—storey buildings, - two matching buildings, - and we filmed each of them from a matching camera angle, and we blew one up at the topl and one at the bottom. and then we could reverse the film and composite the two _ together, reverse one - of the films and composite the two together, so this building had a sort- of simultaneous exploding and imploding event. - this reversing the flow of time, doesn't us being here now mean it never happened? talks backwards. 0k! i think spencer has gotten a bit carried away. as ever, you can find us

on the right order on social media, youtube, instagram, facebook, twitter and bbc click. talks backwards. i'll leave him to it. thanks for watching, and we'll see you soon! talks backwards. hello, there, keep an eye on the sky through the rest of the day because one minute the sun may be shining, the next, a big grey cloud will come along and give you a real drenching. some very heavy downpours in the forecast and then fortomorrow, it's going to be more a case of heavy and persistent rain, that rain quite

widespread — you can see the unsettled weather gathering out in the atlantic. but in the shorter term, yes, we have got some clear skies around. that's why we're seeing some sunshine, but areas of cloud bubbling up and some showers in the afternoon, some of which will be heavy with some hail and some thunder mixed in. the winds very, very light indeed, so if you catch a shower it could be with you of quite some time, it's not going to to go scoot along quickly, but in the sunshine not feeling too bad. the sun is strong at this time of year, temperatures between 8 and 14 degrees. now, the showers will fade through the evening. a slice of clear weather for the first half of the night, but then we see cloud gathering out west, some rain getting in to northern ireland by the end of the night. a milder night for most of us, although for the far north of england and certainly across scotland, we could, once again, see a touch of frost. into tomorrow, low pressure on the scene, this is going to bring some very wet and very windy weather for bank holiday monday. some areas across the east of the uk will start off dry

but rain from the word go across northern ireland and that will push its way eastward throughout the day, some of that rain will be heavy and we will see some wintry weather mixing in over the very highest ground of the pennines and southern uplands, the grampians saw a little bit of snow on the very highest ground. here it is going to be a very windy day and we can expect gusts of maybe 50 mph to 60 mph over exposed southern and western coasts. with the cloud and rain and wind, it will feel really disappointing, top temperatures between 7 and 12 degrees. it stays quite blustery through monday night. much of the rain will start to clear away, as our area of low pressure rolls away eastwards but behind it you can see the white lines, the isobars. you can follow them all the way up to the arctic. that shows where the air will be coming from through the first part of the coming week, that air coming down from the north and that northerly wind feeding chilly conditions in our directions. so it is a mix of sunshine and showers through the coming week. cold days, possibly frosty nights.

good afternoon. the rules which require people to self—isolate if they come into contact with someone who's tested positive for covid could be relaxed. in a trial starting next week, up to 40,000 people contacted by nhs test and trace will be asked to take a lateral flow test every morning for a week, instead of starting ten days of quarantine. 0ur health correspondent, anna collinson, reports. test, test, test. it's a key part of society reopening. currently, if you come into close contact with someone