to tackle terrorism. theresa may plans a new commission to counter extremism. jeremy corbyn is pledging 10,000 more police and security staff. tributes have been paid to two passengers killed on an american train, trying to defend two women from anti—muslim abuse. a man has been arrested. the american rock musician greg allman has died. he was a star in the late 60s group, the allman brothers band. the 69—year—old had struggled with a number of health issues. now on bbc news, click. this week... wall—climbing graffiti bots. all aboard the hollow deck! just watch out for the rodents. oh, there a mouse! data is all around us.

we generate around 2.5 billion gb of it every day. think of it as, well, there's no word for it really... enormous. and we're finding lots of new ways of gathering even more of it. machines are now able to look at videos and interpret what's in the image, and with the number of cctv cameras around the town, imagine how much more data we can collect. but the real intelligence is not in capturing the data — it is analysing it, and this is where artificial intelligence might make a real difference, making connections that we humans never would.

big data has accelerated our understanding of medical science in unimaginable ways. it's now influencing how hospitals treat patients, police forces manage crime and city officials run our towns. and its inevitable in the next 50 years that ai will play an even bigger role in our society and influence how we go about living. i recently met dj patil, former us president barack 0bama's chief data scientist, who is in charge of shaping how big data is being used by the government to make big policy decisions, whilst ensuring that al created by the tech companies treat everyone fairly and make good decisions. that's where we have to start focusing more of our energy. asking the question, how do we actually make sure that these algorithms are going to work the way we want? people are talking about self—driving cars. is a self—driving car going to see someone with my skin tone or someone

with a darker skin tone? a person with a wheelchair? is that type of person in the data set? how do we start saying... so you're suggesting where a self—driving car would recognise you as something it should avoid? avoid, yes. because we have different skin colour. are people with your skin colour the only ones in the data set? am i ignored? was that an accident? but what about, you know, someone with a handicap? what about a kid on a tricycle? it's not sufficient to say, "oops", about the algorithm. we have to figure out a more robust process as these things are becoming more integrated in our society. and if we've learned anything from this week's facebook story, it's that tech companies are not the most transparent bunch. facebook has been around for more than a decade and only now, by chance, have we got a glimpse of how its moderators decide what we see on its platform.

so how do we make sure that the ai built by these same tech companies are using our data responsibly? so firstly it comes down to how are you trained. in our training these days, we often have found technologists are no longer trained in humanities. one of the most critical component of humanities is the notion of ethics. so what we've called for is that every data scientist, every economist, anybody who works with data, must have ethics integrated throughout their entire curriculum, so you construct and have the conversation and dialogue about what are the ethical implications of the choices you make. the second part of this is security of the data. how do you make sure that you're actually building the algorithms with security, the data sets with security, so somebody can'tjust break in? that has to no longer be an elective of outside. it has to be part of the core training. once you have this component of that training, i think we're going to have a new set of people who have the vocabulary to talk about it.

but that doesn't take into account the speed at which data is happening and taking place today. so what do we do there? number one, transparency. president 0bama signed an executive order that says by default all data the federal government, the us federal government, publishes must be open and machine readable, and what that allows people to do is be able to access the data, compare it, use it, and innovate with it. and that is the problem. how do we strike that balance? we need to know that an ai system is not biased, it's learned from a data set that is representative of all of us and its decisions are fair, but we also don't want to stifle its progress, because when it's used in the right way it really can change things for the better. what we've found in one of the problems around our local jail system is that there's a huge number of people just cycling in and out of the system. i mean the numbers are extraordinary — more than 11 million people through 3100 jails. they stay there an average 23 days. 95% never go to long—term prison. it turns out there's a lot of mental health issues, a lot of drug addiction.

so what happens to those people and where is the data going? it stays in silos. the health care system has a silo of it. and criminaljustice. so what happens if you just took and shared that information? if you said, "hey, do you see sally in your data set?" and they say, "oh, yeah, we see sally all the time — she has a drug problem." and if the criminaljustice system was like, "really? well, why are we sending her to jail? let's send her to the right intervention. she has a mental health issue." so, doing that, how much can you save? what's the real impact? miami—dade, florida did this. it cost about $1.5 million to train everybody in the right intervention and share the data and everything. the first year alone, they saved more than $10 million. but more importantly they were able to close a fulljail, and then later on they closed a second jail, because they're getting people to the right care. thank you very much for your time. my pleasure. welcome to the week in tech. it was the week that volvo announced it's working on an ai rubbish truck

that will follow collectors from house to house. ikea said they will release smart light bulbs that can be controlled by voice and sync up with home devices like alexa and google assistant. and google fancied another "go" at go success. the ai system alphago took on the world's number one go player kejie, and won the series. alphago learned to play by studying old matches and playing thousands of games against itself. the hope now is it will be used in medicine and science in the future. more bad news for uber this week, as it admitted it underpaid drivers in new york for more than two and a half years. tens of thousands of drivers will now be paid about $900 each, which will mean uber paying out tens of millions of dollars. and only one month into the release of samsung's new galaxy s8 smartphone virus scanner, and it's already been hacked. german hackers fooled the scanner with only a paper printer and a contact lens to make

the fake eye. and is robocop from the 80s becoming a reality? well, not quite, but dubai police want these robots to make up 25% of its force by 2030. they launched the unit on wednesday, which can forward video feeds to the police, settle fines, has facial recognition, and can speak nine languages. i'd buy that for a dollar! graffiti art has been one of the hottest art movements over the last few decades. like many graffiti artists, graeme — or xenz, the name he goes by — cut his teeth on the streets. in this case, the streets of bristol. and he has since grown into the artist that we see on the roof of his east london studio. today, he's taking a break to do this for us. but he's more known these days for these amazing natural scenes which are exhibited and sold all over the world, and which incorporate

all of the graffiti techniques that he's honed over the years. yeah, over time you really understand what the can is about to do. you know, you come to rely on these tools, like the nozzle or the weight of the can. like the way that i use the edge there to keep one edge sharp and one edge faded, then this, you know, different lines, adding colours. so there's a lot of disciplines that go through painting that are the same here, you know. years of practice... no, we don't have that kind of patience. so could we pull off something similar to this by combining technology with someone who has no creative talent whatsoever? to find out, we sent nick kwek to estonia... tartu, estonia's second—largest city. like most cities, graffiti

and street art provoke around every corner. if you know where to look. it's also home to one of the biggest spray—painted pieces i've ever laid eyes on. but albert's been painted dot by dot, and i've been promised i too can achieve artistic genius with the right tools. believe it or not, these pictures have all been painted with spray paint. they've been pieced together splodge by splodge by the sprayprinter device. my daughter wanted a unicorn on her wall, but i couldn't draw. so that pushed me towards creating this device. to make these magical masterpieces you need the right kit — a smartphone with the appropriate app installed, an external battery pack to keep it fullyjuiced, a tripod to hold it steady, some paint, and of course the sprayprinter. first you select an image

and align it against the area you want to paint. so the image is projected like a giant virtual sticker. portraits with shadows work best. the phone's camera exposes for the led on the device, and when it illuminates it sends the can's location to the app. the phone then tells the printer its coordinates and the printer decides when to spray and when not to. once you get the knack of it, it's actually surprisingly simple to use. you just have to make sure you go from left to right, or right to left, very smoothly, in a straight line. for all its geeky brilliance, it's a real labour of love. even the most simple of designs takes several hours. depending on how complex the picture, and the size, the amount of layers, the different colours you want to paint with, you know, that determines how long doing one of

these is going to take. you need to move your hand relatively steady, so if you start moving your hand very quickly you're losing accuracy. not sure i could really stand here for several hours doing this. with the next model, you should be able to move your hand relatively freely as you would with a regular paintbrush. to give your arm a rest, the team have already started developing robotic versions to do the spraying for them, meaning larger more complex images. i developed this extra accessory for the sprayprinter to atomise the process, because for high scale images the hand—held method takes too much time and effort. soon, others will be able tojoin in too, hopefully speeding things up a bit. but does the printer help artistic expression, or simply kill it? a person who can't draw

at all, this gives, like, guidelines of how to paint. it's like sort of a colouring book, but you can go over the lines, but the paint will still only land in the right places. i think for people like myself, we call them artistically challenged... laughter and i think this device gives them new power. the finished result? it started off only a few small dots. you actually have to stand back a few feet to get the full view, to get the right perspective on it. how good is that? so what would you like to see spray—painted next? well, the guys have been holding a competition and this winning submission, just announced, will soon be painted on a local giant abandoned power station chimney for all to see, but painting on this curved structure has posed new problems, which mihkel is determined to solve.

i thought it would be a good idea to use a vacuum rover, so this is just a four wheeled platform that drives across the wall. it attaches to the wall using vacuum. yeah, and in true blue peter fashion, here's one i made earlier. yeah, all me. entirely done by me. all of it. well, that was nick kwek with the sprayprinter. graeme, worried? not really, no. i mean, it's a great tool. it works like a projector. it helps us to get these large images up easier but no, i think i'm quite comfortable in what i'm doing right now. i might use it one day, though. it definitely has its advantages, for sure, yeah. well, in the meantime, this is beautiful.

thanks so much for doing this for us. thank you. we're going to stay on an art tip now. over to lara lewington. here at photo london art takes many forms. but the thing i've seen that i've grappled with the most is the idea of a virtual reality gallery. is this really a way to fully experience art? this lot certainly seem to be engrossed in the experience. so what's going on in here, and in here? well, in the 1800s when people saw photography for the first time they were absolutely wowed by it, but of course now we are a little harder to impress. so what's happening is, some of those initial images are being brought back to life in virtual reality. here in this room, the birmingham gallery where fox talbot‘s original original photographic images were shown has been recreated in vr.

well, initially i wasn't sure that looking at these images in virtual reality seemed like something that actually makes sense, but apparently you can pick up the images by holding your hand over it like that, and then you can hold the image in your hand... ok, that's pretty amazing. you can really see the texture of it as well. this genuinely feels like i'm standing in front of a fire. in fact, it actually feels quite hazardous because you can see smoke coming off it and that is proper serious heat. 0h, there's a mouse! oh, no! thee mouse actually looks so real! but whilst the juxtaposition between the origins of photography and a new visual medium are deliberate, making sure it provides a meaningful experience for those with a yearning for art has proved a challenge. nothing fills me with a greater melancholy than going into an exhibition and seeing

somebody with a virtual reality headset on, and having to queue and wait for your turn on it — it's just not very stimulating. so what i've tried to do in this installation is to make that part of the actual experience, so when you're not in the room you can look at people with their headsets and backpacks on. watching the goings—on of people wandering around is quite strange and surreal to look at, so hopefully it's still interesting as an artwork even when you're not in the headset. so i can hear some sound coming from over here. that's because of the binaural sound that's built in, and there seems to be something happening outside... i believe this is the chartists‘ revolt. this is a lot of people objecting to photography. this wasn't the only vr at the show, though. 0ne family of art collectors wanted to virtually take their wares out of storage. you can have your art museum in your pocket. i can have 200 metres just in my laptop. that could be sharing a collection

internationally, a trip to a virtual art gallery for those who are housebound, or introducing a new audience to art who might be more tempted by the vr element. the real—life version of this statue is 15 metres tall. i will head towards it and have a closer look. i can actually see the size of it by those people walking around. and in fact the size of that piece of art behind it, the scale of all of this, is absolutely massive. it would require such a large building to actually house all of this stuff. amidst the physical art were the latest techniques in holographic imaging, entire film is superimposed on single images, and this paris park scene. so behind this photograph we are looking at here is actually a massive plate of led lights, all spread out with an inch between them, so each time you can see a person crossing the screen it's actually a combination of these lights being dimmed in that pattern, and what the human eye fills

in in between to make it a complete opaque figure. amazing. one thing that seemed clear by the end of the day, though, was that vr can feel a natural part of an art show, and that i'm never going to be an art expert. elastic bands, and bulbs? one of the brilliant things about working on click is that we all get to achieve our lifetime ambitions at one point or another, which is why this week mark cieslak became the captain of a starship! he took some of the rest of the click family with him, to boldly go where no mark has gone before. space, the final frontier. these are the virtual voyages of the bbc click team. our mission: to wear vr headsets

and discover strange, new technology, and boldly go where no tv reporter has gone before. virtual reality game star trek bridge crew brings together up to four players, each taking a different role on the bridge of a starship. the beauty of going where no one has gone before is that starship travel involves an awful lot of sitting down. sitting down is great for virtual reality because the headsets have got these cables. if you're moving around it's easy to get caught up with them. sitting avoids all of that.

and where better to be sitting than in the captain's chair of the federation starship? headsets on, it's time for the click team to become a starship crew. wow. it's really strange. that's brilliant. incredible. oh, my goodness, mark! hi. i'm dabbing. all right, people? let's trek some stars. the early missions are all about orientating us with the bridge and how we interact with it. as helmsman, you are the ship's navigator. the headset shows us what the bridge looks like, but the playstation motion controllers allow us to interact with the various controls we have to master in order to fly the ship. help. yes? walk course to gamma hydra. engage. 0h, we're warping, everybody. 0h! wow.

that's pretty, isn't it? that's good. wow. we don't have time for sight seeing, though, as we receive a distress signal from a stricken vessel. my vessel has lost all power and our life—support systems are nearly exhausted. here we go. scanning now. get on that scan. ok, so, engineering? yes. can you transport the survivors to here? i don't know. chuckles that wasn't in the training. laughter we're homing in at an alarming rate, captain. there are no options within transporter. it says right there in the list. transport, energised. it's at this moment that the action takes a turn which will appeal to star trek super fans. 0k, guys, this is the kobayashi maru scenario. this is an impossible to win situation. 0h! it's a d51 cruiser.

it's a klingon d5 cruiser? yes. 0k. target it. bring us about so we can actually see that the vessel. bring us in behind it. come on! west, west, west. turn it, turn it, turn it. behind us. 0perating. there it is. 0k, bring in those torpedoes. line up the phasers, and torpedoes away. get us back behind it. target destroyed. 0h! yeah, everybody, we just violated a peace treaty. wow. oh, wow. it's pretty warm work being in virtual reality. it feels like it's social vr at its best, really. communication‘s a must. if you don't have it you're not going to complete the mission. great for team building.

i thought we actually had our lives on the line fora minute. that ably demonstrates the power of teamwork. it's really, really important that everybody plays their role on the bridge, because if you don't then chaos ensues. we had a couple of sticky moments there, but i think we managed to pull it back and keep it together as a crew. and the result was a successful mission. brilliant. that was mark and the crew. that's it for this week. follow us on twitter @bbcclick. 0r like us on facebook, too, where you can see lots of extra content and videos. now, while you're watching this we are doing a live show at the hay literary festival in wales. and next week on the programme you can see a little bit of what we're getting up to. can't wait. and if you're coming, i hope you enjoy the festival. and we will see you next week. hello, it has been a fairly quiet

morning across the uk, but we are expecting some changes. there will be dry weather and the sunshine for most, but storms are waiting in the wings to head our way and this is one part of the uk that will see changes in the afternoon. somerset. where we had sunshine earlier. heat and humidity and the storm clouds heading our way. we have had storms in the bay of biscay and in parts of france and that is pushing up over the channel through the afternoon, mainly focused on the south of england. further north we have a dry and bright weather and sunshine. the winds will be lighter than

yesterday, but there is a northerly breeze in scotland and temperatures will be 10 degrees lower. compared to yesterday. similar temperatures with sunshine in northern ireland and a touch warmer in northern england and north wales, but going downhill across the south wales. this is where the main focus of the storms, torrential rain and gusty winds. temperatures into the mid—20s in the south—east. 0vernight, the storms become more widespread across england and wales and the rainfall becomes heavy. light rain for northern ireland, nudging into northern scotland, and a more co mforta ble northern scotland, and a more comfortable night for sleeping, but a very muggy night ahead for the south of england. the rain marches north, thunderstorms and torrential rain in northern england and the wet

weather making inroads across scotla nd weather making inroads across scotland and clearing away from northern ireland. the cloud might be thin to have some sunshine. very much cooler in scotland, temperatures about 12—13, but the rain clears away overnight. as we head into next week things move from the atlantic weather front, arriving across the uk on tuesday, and after that building pressure for a good few days. you should be turning dry and it will feel quite warm. —— it should be turning dry. this is bbc news. the headlines at 1pm: more cancellations and delays for british airways passengers, following the global computer system failure yesterday. its been a disaster. there are shots behind me of people in the first 0, which goes over into a second 0 and then a third before they can even

get the registration desk. the conservatives and labour promise to do more to tackle the threat of terrorism, if they win the election. the 22 victims have been remembered in church services across the city this morning. tributes to two passengers killed on an american train, trying to defend two women from anti—muslim abuse. also: the american rock musician gregg allman has died. # back home you'll always run #. the 69—year—old became a star in the late 60s as part