myanmar‘s rakhine state for the first time since the mass exodus of rohingya muslims began. the un has been demanding access since august, when myanmar‘s military launched operations against rohingya rebels, sending 500,000 people fleeing into neighbouring bangladesh. help is on its way to the millions of people affected by two hurricanes in puerto rico. a week after hurricane maria made landfall, almost half the island's population, almost two million people, are still without clean drinking water. fuel and medicine are also in short supply. nearly 100,000 people on the indonesian island of bali have now left their homes near mt agung, because the volcano is expected to erupt for the first time in 50 years. an exclusion zone of seven miles has been set up. vulcanologists have been recording hundreds of tremors each day. now on bbc news, it is time for click. this week, how safe is your face? pinpointing pollutants...

and... i'm not sure you're pointing that hairspray the right way, lara. facial recognition. tech that can identify someone from their face is fast becoming a thing. this biometric id has been used, albeit together with passports, at immigration control in airports. in dubai, they want to do this without the gates, allowing passengers to walk more easily through the airport. and it has also found its way into apps as an alternative to passwords for

validating a payment. face recognition could be coming to shops. in china, alibaba recently premiered their smile to pay system at a kfc store. unlike our passports, pin codes or passwords, our faces are on public display pretty much all of the time. and that makes it possible for the authorities, or anyone else, to automatically identify us in any public space — something you may not be surprised to hear they are quite interested in doing. dan simmons has been looking at the preparations made by several governments. to start, you've been to germany? yes, it seems we could be moving towards a biometric cctv sort of state. and one of the places where it is first happening, which may surprise you, is in berlin. catching a train in the german capital today means you might be caught on cctv, perhaps

while stamping your paper ticket. neither system automatically tracks your movements, at the very least that requires human intervention. but arrive at sudkreuz, in the south of the city, your face will be scanned and analysed by computers. the testing of facial recognition systems began here last month. the authorities are not looking for criminals just yet. they aren't really looking for me, either. around 200 volunteers have had their faces scanned and been given a location tracker, so the authorities know when they pass through here and they can see how often the cameras can pick them up, just by looking at their faces. if the system's accurate enough, then the next stage will be use it much more widely — which, for many, would be a breach of privacy. being constantly monitored with no easy opt—out. the germans have a history

of being watched. this old us listening station in berlin was how the west kept tabs on east germany. 0n the ground below, first the nazis and then the stasi in east germany kept files on the population, filled by informants. so, since the fall of the berlin wall in 1989 and the decommissioning of id checkpoints, berliners have been fiercely protective of their privacy. what has changed is that a new threat has replaced the old. police control the crowds in the aftermath of a terrorist attack. a truck has mowed down shoppers at a christmas market in berlin, 12 were killed and more than 50 injured. at this time, cctv is still not widely used in public. but three months later, in march this year, the government passed new laws to extend their use and the face—recognition pilot

was given the go—ahead. despite the trial offering a white route that passengers can take to avoid the cameras, both the country's data commissioner and top lawyers have expressed concern about germany moving towards a surveillance state. no—one is saying facial recognition couldn't help catch criminals but the public doesn't seem to have been asked. as germany goes to the polls this weekend, one member of the coalition who has been in power told me he wasn't consulted about the trial and the technology has not been publicly debated in parliament. it does not bring more security. it is just collecting data, and more and more. you don't know who, when, where this data may be used. it is a pill they tried to give it to the people which doesn't have any effect because it doesn't solve the problems. proponents of the scheme point to the dip in crime

following the installation of cctv back in 2011. we asked both the german interior ministry and the police authorities in berlin for an interview and to take a look at the technology, but both declined, so we asked some travellers. i don't trust this system. i don't trust this new development. like, everybody should be tracked and scanned by cameras. they showed on television that if you have a base cap on or sunglasses, it doesn't work anymore, so maybe not so much. but anyway, if it catches one, we are very happy. it really shows that it will help, then i will be ok with it. in the hope that there is no misuse and no tracking, just collecting tracking data. if those worries are widespread, it is not looking good.

questions still hang over whether the german police fabricated their records on the man behind december‘s terror attack to make them look good. and earlier this month, a privacy international report said 21 eu memberstates, including germany, are still unlawfully collecting and retaining personal data. who's watching the watchers? that may be the key question if the technology proves its worth. 0k, first up, we are tracked by our phones every day anyway. so what is the big concern around facial recognition? with our phones, we can possibly turn them off or opt to carry a more basic model. we do have some choices around that. it tends to be companies that collect data. so when the police or the state require that information, they do so on a case—by—case basis. the concern here is that if we introduce facial recognition, as we have cctv, there would be a very broad database, a sea rchable data base, to find out where each person

was and with whom, whenever they were in public. 0k. to be fair, it is just a trial. this has not been released yet? no, it is a trial, absolutely. just on those 250 volunteers and those members of the public who walk through the space where they are captured on camera. there is another capital city where this technology is already being used by the police to look for real suspects? yes, here in london, where the most recent trials took place last month. carnival time in notting hill. the tens of thousands who gathered were monitored above and by officers on the ground. there were also facial recognition cameras here — and, unlike in berlin, the london trial is not as visible to the public. the officers are using it to spot real suspects.

the metropolitan police declined to show us the technology or to give us an interview, so we spoke to a human rights expert who was invited by officers to witness what happened. in the ten minutes that i viewed facial recognition in action, i saw two misidentifications. in fact, both of them wrongly identified an innocent woman walking past as a wanted man from the police‘s database. right, they didn't even get the gender right. those are false positives — are the police concerned about that? they weren't worried about that. however, they were running it for four days. they told us that they had made many false positives. the system had produced many false positives. she says officers told her they had made one correct match in the four days of use. the leads i met viewed this as a success.

the people i met viewed this as a success. as long as they can prove that the software works, it can make a positive match, even if it is making a0 incorrect matches, then it works. that's not a scientific approach. there is no balance or proportionality, let alone a disregard for the civil liberties issues. that is not a success, to our view. some people will say that the technology needs to be tested in real—world circumstances and this is what the police are doing in this situation. they have to test it and it could be useful in the future. we all have something to worry about when the police are using intrusive biometric surveillance powers that they don't have a legal basis to use and that they are doing largely in secret. but these kinds of surveillance tools present some really broad concerns and to simply say "i have nothing to hide, therefore i have nothing to fear" is to unconditionally submit to powers of government that are unchecked.

and that is to say, whichever flavour of government comes in, would we be happy with biometric surveillance on out streets? i don't think we would. london's metropolitan police told us: they declined to comment on the effectiveness of the technology. they declined to comment on the effectiveness of the technology. that is slightly concerning, isn't it — especially if the software really is that inaccurate? and i guess we haven't had any kind of public debate about whether this technology should be used. no, not really. i mean, the police say there will be a public consultation. we asked them how long we would wait for that, and they said it would

happen in due course. so we checked parliamentary records and although facial recognition has come up for debate within other bits of legislation around anti—terror laws, etc, there has never been any specific debate around the use of facial recognition in public in the uk. meanwhile, the technology continues to advance and researchers are looking at even more complex technologies. two examples in the last month — cambridge university said they are developing a system which could potentially identify people with scarves over their faces or wearing hats, and stanford university in the us say they have developed algorithms that can look at the results of what comes through the camera and determine somebody‘s sexual orientation. you are looking at something potentially in the future when this technology starts to take off, where you could walk past a camera and you're automatically added to a database you would not necessarily know about.

and therefore, as your human rights would say, you could complain and get something done, but you wouldn't even know that it had happened. a lot to talk about in the future, unsurprisingly. dan, thank you. from filming yourface to feeding it now — this is london's borough markets. a foodies paradise, stuffed to the gills with gourmet grub. but this week, designers from the royal college of art alongside inventors have descended on this bustling street market to show off a host of gastronomic gadgets. first up, bottle openers that are supposed to make beer tastes better with sound. according to ma student drew richards, the flavour will be better as a result of the satisfying sound. instead of mixing vast quantities of a recipe before unveiling it

to the public, this professor has been experimenting with crowd—sourcing ingredients using a web game that mimics the stock market. having a large number of consumers and playing the game, and in other words telling is what their preferences are, which we took away and we are creating the formula. bottoms up. brilliant! this student has created cutlery with handles that can be heated, which claimed to slow down child ren‘s eating habits. slower eating has been shown to make us feel for more quickly. it is hoped that these snazzy knives and forks will do just that, encouraging healthier eating habits in children. and finally, over in the kitchen, students from the rca and nottingham university hope to capture family recipes that have been passed down from generation to generation by analysing video

of visitors preparing food and collecting data from accelerometers attached to cooking utensils. recipes will be generated to record the way individuals prepare food. we believe that people are better able to articulate their preferences and ideas around food using their bodies. we are putting sensors in kitchen tools to capture those ideas and developing a repository of recipes using the data. so those old family recipes need never be lost in the midst of time ever again. yeah, anyone else pecking now? hello and welcome to the week in tech. it was the week that apple released a new version of their operating system — cunningly titled ius ii. google announced an £800 million deal with smartphone maker, htc, and transport for london said they will not renew the licence for ride—hailing company, uber, when it expires at the end of september. tfl said the company was not fit

or proper to hold a license. uber said it will appeal the decision. it was also the week that prime minister theresa may called for technology companies to go further and faster in removing extremist content from the web, the prime minister also called for social networks and search engines to find ways to take down terrorist materials within two hours of publication. and history was made this week as an electric vehicle broke a world record, by travelling more than 1000 miles on a single charge. the 40—foot long test bus travelled 1102 miles on a testing ground, in indiana. the company has not revealed how fast it was going, though, saying only that it travelled slow and steady. and a while a go we told you about the tragic demise of our good friend, steve,

the robot security car who sadly perished in a washington fountain. well, steve's parents are back and have spawned a new breed. the k7 has been specifically designed to fight crime in large areas with difficult terrain. will it suffer the same ill fate as steve? 0nly steps will tell. "ah, that is the smell of a killer!" those the words of london's mayor, sadiq khan, who said that london's air—pollution is way beyond acceptable levels. you cannot really smell much, i know, but the health problems are caused by petrol and diesel cars have caused france, the uk and now, this week, china to consider banning them in the relatively near—future. laura is up, in a few minutes, to look at pollution in unexpected places. but first sumi das off to west oakland, near san francisco, another place with lots of diesel pollution and a lot of people with breathing problems. we have been meeting the science and tech experts who are trying to pinpoint pollutants.

can you see them? harmful pollutants. we cannot detect them but this google street view car can. inside is a minilab from environmental sensor start—up, aclima, that monitors air quality. we have this system that we've mounted onto the street view camera platform that has both meteorological instrumentation as well as the inlets — this is where we actually sample the gas, the pollution, as we're driving along. for one year, two street view cars, supped up with aclima tech, crisscrossed west oakland, california — roughly 12 square kilometres, bordered by freeways and home to a bustling port and families. 37,000 kilometres and some serious number crunching later, researchers had this detailed pollution map. steven hamburg, of the environmental defence fund — a partner in the project — explains how. you need fast response instruments,

that are collecting data every second, and then you need the analytical capability to actually then use that data to actually map it, in a way that is just characterizing that local spot. each dot represents about 30 metres. the colour indicates air quality. the darker the dot, the dirtier the air. red dots cluster around hotspots, like this metal recycling plant and this busy intersection. researchers hope this data will spur governments to start regulating — city officials could divert diesel vehicles away from schools, or re—time traffic light so lorries aren't idling. all this equipment, crammed into this car, it is high precision stuff and it's pricey — too pricey to put on a fleet of vehicles so aclima developed a sensor system to measure pollution levels — that system will be about 100 times cheaper and about the size of a couple of shoe boxes. imagine adding air—pollution as a layer in your mapping app. it starts with the measurement, of course.

the number of times we would need to sample a region to get something that we feel is baseline for that area and then understanding the variability around that baseline. it's ambitious and a massive big data challenge. for now, aclima has a real—time tracking tool and that is more than just a breath of fresh air. it is easy to think of air quality as an outdoor issue but maybe it is time that we start to think about the air that we are breathing inside our own homes. air—pollution comes in many forms. in our homes that includes outdoor polluted air coming in through open windows as well as being caused by cooking, lighting candles, burning insense or the use of everyday products. so to test a couple of the latest

indoor air quality trackers, i have enlisted the help of professor roy harrison, an expert on the matter who also has his professional air quality monitor kit to hand. first off, time to take a base reading. firstly we have the foobot. this gives us three different pollutant measurements. it gives us particular matter. except that it is not telling us what size fraction it's measuring. we are getting a little less than that on our device. we're getting between 5 and 10 micrograms per cubic metre. but it looks like a very plausible reading. and netatmo's healthy home coach. in terms of air quality, this device is measuring carbon dioxide. slightly strange because, from a health perspective, it is not one of the pollutants we are very concerned with. some health—releva nt pollutants will be high in carbon dioxide but others won't. although the professor did add this reading was two low to be plausible. for our first experiment,

let's burn some toast. things are really peaking. there's quite a reaction there to burnt toast. those are very high concentrations. it's sort of beijing—type air quality, in here at the moment, not london. so let's take a look at what the other device has been tracking, the netatmo. so actually, no, it has not reacted at all to this smoking episode but then burning toast does not generate much carbon dioxide, unless you actually set fire to it. fair enough. the foobot turned from blue to red, half way through that so it obviously knew there was a problem. what do you make of the readings? if we look at the volatile organic compounds, that has gone up about tenfold and that is very plausible. i'm just surprised that the particulate matter, which is still reading 17.5, has not responded. maybe it is a very slow, i don't know, but you do have the advantage that you're measuring three pollutants and the device is giving us a grade warning. on to experiment two and luckily the professor was happy

to play along. the hairspray did not cause a reaction from the netatmo c02 sensor, whilst it did alarm the foobot triple sensors. it is responding to the particulate matter. the volatile organic compounds, which would be the main component of the hairspray is up to 8,400 so that has gone up a lot for the background. it's not hugely high. what is very strange is the carbon dioxide has gone up to 30,000. which is a level that would worry me to be breathing, quite honestly. it is a little hard to breathe in here at the moment. it is a huge level. it is all very well to knowing the quality of the air you are breathing but you may want to do something about it. a device like this aims to purify the air by first of all tracking it,

so it knows what the quality is, at any given time and if the quality is poor it will do more purifying to bring it up to a good level and if the air quality is ok, then it can pause. the dyson pure cool link does come with a hefty pricetag and this model is the size of not so small child. its motor aims to draw the polluted air into the device before filtering it and dispersing the clean—air back into the room. clearly we had a spike in the pollution level but it has not gone as high as in our earlier spraying experiment. i am impressed that it is coming down very much more quickly than before. and we've moved from very "poor" to "core" on here. my tests seem to indicate the rather odd result that fixing the problem may prove simpler than actually monitoring it. that was laura and before that sumi das in california. that is for this week.

don't forget, we live on facebook and on twitter. check us out throughout this week and every week. thanks for watching and we will see you soon. hi there. it's been over a week now since hurricane maria devastated the island of dominica and puerto rico, in the caribbean, leaving more than a0 people dead. many still remain missing. since then, the hurricane has been working just past the east coast of the united states. it is a weak hurricane now, a category1 storm now, but over the next few days it could come closer to home. it is going to work northwards, getting tangled up with low pressure. not a hurricane, but the remains of maria could be heading our way through sunday night and into the early hours of monday, potentially bringing wet and maybe windy weather to the north—west of the uk.

that's a way off. before we get there, this is how we start the day on thursday. a lot of cloud, outbreaks of rain left over from the night—time system. but it will be a mild start to the day, as well. that rain band still with us, then, across north—eastern scotland, with a fairly brisk wind. a lot of low cloud and misty conditions, too, around some of the hills. northern ireland starting today on a rather cloudy node, but some sunny spells for wales early on in the morning. whereas further east, across central and eastern england, there'll be a hang—back of cloud. through the day, outbreaks of drizzle which could be extensive. may be misty over the hills, as well. in fact, that cloud will be slow to break across east england, eastern areas of scotland, probably only breaking up as we head in the afternoon. but it is then that most of us should see some sunshine coming through. but the rain set in, really, through the northern isles, picking up. quite a cool day here, but otherwise some decent temperatures. 20 degrees in london.

we're still on the warm side of average. through thursday night, though, the next atlantic system making its presence felt, working into northern ireland before spreading to scotland, western parts of england, and wales, too. tied in with this area of low pressure spinning in of the atlantic, bringing some fairly strong winds into the far north—western coast. so, for friday, a band of rain to start the day, pushing east across scotland, england and wales, heavy at times. behind that, yes, we'll see some sunshine, but also some blustery showers in northern ireland. with the showers, looking at temperatures coming down. feeling a bit cooler, but still relatively mild across eastern counties of england, that rain reluctant to clear away. saturday, though, a decent start to the weekend in many respects. many dry areas with some sunny spells. some showers around, maybe some lengthy showers around wales. but it is during sunday night and into the early hours of monday that the remains of maria could be coming our way, to bring some pretty heavy rain to the northern parts of the uk. that's your weather.

welcome to bbc news, broadcasting to viewers in north america and around the globe. my name is mike embley. our top stories: the un gets the go—ahead to enter myanmar‘s troubled rakhine state. we will hearfrom one rohingya militant about his struggle against the burmese army. translation: the army surrounded our villages. the people had no weapons. 0ur army said, you're going to die anyway, so you should die for the cause, and be martyred. a week after hurricane maria, help is on its way to puerto rico, where half the population still has no access to clean water. bali's biggest volcano threatens to erupt for the first time in 50 years. almost 100,000 have fled the danger zone. and a sticky situation for one australian women, as a swarm of bees transforms her house into a giant hive.