the headlines: tear gas and water cannon have been used by police in hong kong in violent clashes with thousands of protesters who gathered to mark the fifth anniversary of a pro—democracy campaign known as the umbrella movement. riot police dispersed protesters after activists threw petrol—bombs and damaged government offices. afghanistan's incumbent president, ashraf ghani, has appealed to taliban militants to respect the people's choice in saturday's general election and end the war. the country's election commission extended voting by two hours, but turnout appears to have been low. several people died in taliban attacks on polling stations. reports in the us media say the white house has imposed unusual levels of secrecy on transcripts of some of president donald trump's calls with foreign leaders. they come as an impeachment investigation into president trump over his administration's dealing with ukraine is gathering pace in congress.

doctors are heralding an extraordinary transformation, in the treatment of a deadly form of skin cancer. ten years ago advanced melanoma was seen as untreatable, but a clinical trial shows half of patients are now surviving for at least five years. the drugs involved target the immune system, and are already available on the nhs. our health and science correspondent james gallagher reports. pam smith is alive and well, but it's been more than five years since she had the devastating news that her cancer was untreatable. an aggressive melanoma had spread inside her body and she says she didn't stand a chance. but pam took part in a pioneering trial and says it saved her life. without having those drugs like that, i might not have got to see my grandchildren. so... because it's just over the five years now since it happened

and my youngest grandchild, he was six at the weekend. so, you know, i wouldn't have seen him growing up and the other grandchildren as well. ten years ago, people usually died within 6—9 months of being diagnosed. this trial on 916 patients tested a combination of immunotherapies and showed 52% were still alive five years later. the doctor who's presenting the data at a cancer conference said the impact was an amazing surprise. it's been the most extraordinary transformation from a disease that was regarded amongst all the cancers as the most difficult to treat, with the most serious prognosis. pam has not been cured. her cancer halved in size after treatment and has not grown in five years. others are in complete remission, with no sign of the tumour in their body. we are so encouraged by today's news, and now there's this air of positivity and it's given

lots of melanoma patients and families a lot of hope and a bit of a spring in their step. immunotherapy is nobel prize—winning science that is making the untreatable treatable. james gallagher, bbc news. it is 4:42am. now on bbc news, it's time for click. this week — smash hits, smash hits, and extreme mic testing. thursday was bbc music day, an annual celebration of the power of music to change lives, with 2000 events across the uk and 100 broadcasts on tv, radio, and digital. but it's important to remember that not everyone experiences sound in the same way.

for example, this week is international week of the deaf. so we met twins hermon and heroda berhane. now, they're both deaf, and although they love dancing and they love going to deaf raves, there's obviously a lot about music which they don't experience — until now. we joined them when they tried on a prototype shirt which can turn music into a whole—body experience. we were born hearing, and when we we re we were born hearing, and when we were seven we became deaf at the same time.

the beautiful rolling hills of the south downs in sussex. something which i'm about to see from a whole new perspective. up there. i'll be filming myself while i'm up there, but the most important thing for today is this microphone, which i'll be taking up with me. why? tell you what. let's go back to the beginning. if you've ever tried to record sound outside or even if you've tried making a phone call on a breezy day, you will know that wind is the enemy. even the slightest breeze causes turbulence on the mic, which you hear as a pretty deafening roar. now, the best way to solve this

problem is to stop the wind from getting to the mic by using a big, soft bit of material like this. something which we in the trade call a fluffy or a dougal — or a dead cat. the bigger the fluffy, the better the wind is blocked out, but there are times when a large microphone just isn't convenient. like, for example, when you're doing back flips through a snowy street or travelling at speed over not very much snow. energy drink maker and extreme sports nuts red bull wanted to record their athletes up close and personal, so they asked a hearing aid, headphone, and microphone designers jabra to make something small, light, and cable—free to stick in places where there's no room for a big fluffy. jabra's research into noise cancellation and sound enhancement goes on here at their

headquarters in copenhagen. and this is where the x mic was born. because they need to test their devices in lots of different audio conditions they have different rooms with different acoustic characteristics. this is the anechoic chamber, which is completely acoustically dead. this is the reverb chamber where they test noise cancellation is. and this is the wind tunnel, where we currently have a breeze of two metres per second. but if we increase that to eight metres per second you should start to hear a lot of rumbling on my microphone here, which will be quite unpleasant to listen to. and if we take it all the way up to 15 metres per second, my guess is that you will really struggling to hear what i am saying... inaudible. if we switch to the x mic audio, i'm hoping you should still be able to hear what i'm actually saying. all right.

this really is maxing out the wind tunnel and even the prototype x mic is struggling. but, obviously, it's still doing a lot better than our mic. part of the secret is in the soft, fluffy fabric, part is in the round shape which reduces turbulence, and parties in the digital signal processing — dsp — algorithms which subtract the windows from the recording as it's being made. what we've done is we've learned through years and years of testing what is wind frequency and what is other sound frequency. and then we set those dsp algorithms to make sure we block out the frequencies that we believe are wind, what frequency range we want to block out and what we want to keep and let through? so the x mic mark i has done 0k, but not brilliantly in the wind tunnel. but how will the mark ii do in the wild?

we'll find out a bit later when i can finally get my amateur backside off the hill. hello and welcome to the week in tech. it was the week that facebook said it would not fact check politicians. the social media giants says posts by politicians are newsworthy and should be seen and heard. amazon announced that alexa will soon be able to bring the voices of samuel ljackson and other celebrities into your home. their speech will be computer—generated based on voice recordings provided by the stars. and the port of antwerp has unveiled a hybrid hydrogen—diesel tugboat to replace the gas—guzzling diesel—only ones usually used to guide container ships.

remember boston dynamics‘ spot the dog? a bot that can climb hills, pick up objects, and open doors and is now available to rent for less than the cost of a car. though you may not be able to use it to do the school run. but he's also shared the headlines this week with the company's gymnast bot. atlas does handstands, rolls, and jumps that could rival an acrobat. and, finally, in other robot news, could these shape—shifting creations provide a whole host of useful tasks? shape bots are controlled by a central computer and camera trackers and hope to protect you from hot drink spills on tabletops, create moving 3—d maps, and more. that's all very well, but i'm still waiting for a robot to be able to just do my laundry and cook dinner. sound is something that's around all of us all the time. when we identify those sounds as signifying danger,

we've evolved to recognise those sounds and react to them. in the modern world, we have become ever more used to isolating ourselves from the world around us. for most people, recognising those sounds is something we do every single day, but getting devices to recognise different sounds is something that has traditionally been challenging. now, one uk—based company claims to have cracked that problem. audio analytic has developed a new technology to recognise a wide range of sounds that can then be used as a trigger for a number of different actions. now, what this technology does is it uses software—based artificial intelligence to identify and recognise everyday sounds. and it can be integrated into a number of products. i'll show you a couple of examples of how it might work. one common application is in headphones. walking down the street for example, there is an angry dog nearby. barking.

speaker: caution, there is a dog nearby. increasing transparency. so what it would do in that situation, it would recognise a dog barking, lower the music or cut it out altogether in your headphones and warn you there is a dog nearby. another application it would have is in smart speakers, most of us have these things around the home now, and it can be arranged to listen passively for things like a baby crying. baby crying. fundamentally, sound recognition is very different from speech recognition, and we have had to come in and solve some of those fundamental differences. baby crying sounds very different to another baby crying. there is a huge diversity from when they are six months old through to when they're two years old. but all of that we refer to as "baby cry", so there is some commonality, and we need to teach those machines that commonality. but as we know, ai can only ever be as good as the training data it works with. so they have to capture

these sounds live. naturally, we wanted to witness this first hand. and what better way to start than with a couple of very good dogs. this is an anechoic chamber, or in this case, a semi—anechoic chamber. it is designed to absorb sound. we are here to record these two beauties, hopefully barking on demand. barking. these waveforms i can see on this screen are the representations of what is coming off the microphones in there. and in the middle is the actual dog bark threshold that the system is listening for. and when it identifies them, you should hear it activate. speaker: hey monty, i can hear you barking. as it is late and you are home alone, i am going to alert your owner, turn on the lights and place onjazz, because i know how much you like it. nice. but dogs, as good as they are, are only the beginning.

the space here can be used to record anonymous range of sounds, ranging from the dramatic... siren wails. to the more low—key. bell rings. there is no shortcuts to this, it is literally, you have to have the data set. we have to go and collect all the data, so we have the world's largest collection of audio data, 15 million audio event files, that help us train the technology itself. and of course we couldn't leave without taking a sledgehammer to some windows. glass smashing. all in the name of technology, of course. that was paul. i'm back at the south downs hills where it's time to test thejabra x mic mk ii, designed to reduce noise in extreme sports and record high quality audio

straight onto this tiny device. i am pitting it against the best professional mike we have that is even vaguely portable, in that it cabled to a zoom recorder and stuffed into my pocket. exactly what you don't need in extreme sports. and for a more realistic comparison, i'll also record sound on my phone and my gopro. now all i have to do is run, run, run like the wind! yeah! laughs. ahh, wow! so we are up, and the wind is definitely blowing in my face. we are flying at about 25 mph at the moment, so it's time to see what all the mikes sound like. loud wind noise. try to put your left knee

over your right knee, squeezing it round... oh, wow. although you can hear my voice on my phone and the gopro, the wind noise is pretty intrusive. it would certainly blast out the subtleties that jabra was specifically asked to capture. so, how about our high—quality mic with all its cables, versus the relatively small x mic, with no cables and on—board recording? so at the moment i have no idea what these two microphones are actually recording, but what we'll do when you watch this is we will switch from this normal mic to the jabra x mic... wind noise cuts out. ..and i will guess that you will instantly hear the difference — you should hear something that is a lot clearer, and with very little roar of the wind noise. although my voice is pretty clear in both recordings, the background wind is definitely reduced. so much so in fact that we can hear jess all the way behind me, telling me about paragliding in the himalayas.

what is paragliding 12,000 feet like, is it a different experience? yeah, everything isjust a bit more full on in the mountains. wind noise increases. so the developments in the weather, and your understanding the clouds... wind noise cuts out. and just loads of amazing birds, huge, massive vultures and the like. interestingly, the x mic is not going on general sale. instead, jabra are using it as r & d for its existing, more down—to—earth products. if we can get a microphone to work at 100 kilometres an hour down a ski slope, you can bet that in an office, noisy office, you can make a very good phone call without any noise disturbances. well, i am about to cause a disturbance in this freshly ploughed field. so wish me luck. all right, we are about to land, are we? we are going to come in to land. we will come with nice speed, and like a bird landing on a branch, just before we touch down,

i pull the brakes and... yes, yes. i smashed it without smashing it, which is brilliant! easy landing, easy landing, very good. the ziggo dome, amsterdam. performing here is the legendary sir elton john, currently on his farewell tour. but he has added a little something extra to each night and it is called peex. it is a device that allows you to mix live music as it is being played in front of you. boost the volume of instruments, listen to nothing but elton's voice, but how does it work? # benny and thejets... first of all the music is recorded onto peex's system where it breaks down the 95 channels of audio coming from the stage into five different musical categories. those five mixes are then sent all the way here to the back

of the hall and sent out again as radio waves by these transmitters. but to make sure that everyone gets a signal, five more transmitters have been permanently installed above the stage. and a tiny microphone on the device listens to what is being played on stage, so it can sync up with the mix that your device is being sent, so when you adjust the levels, it will be in real time. people have paid a lot of money for concert tickets, and people in the funny seats, if you can give them better quality sound, it will make everybody happy. right, elton is about to start performing. let's see how this thing fares. full band plays. guitar only. organ only. drums only.

wow. that sounds great. the vocals are crisp, the guitar, you can really hear it, but because i am too close to the stage, i can't really distinguish what i'm hearing on stage and on here with the drums. so what i'm going to do is go to the back of the hall and see how it fares there. it works even better further back from the stage. to listen to the mix you make, you are given normal earphones instead of noise cancelling, so you don't lose out on hearing the atmosphere too. for people who are hard of hearing, which essentially you do have locations in the concert hall where people can come and hear, this allows them to actually be anywhere in the concert hall. peex is not for everyone. there are people who already have superior sound quality and they do not wish to have it improved, but there are people who want to experience concerts in a different way, so it is really

allowing for everyone to opt how they want to experience the concert. and that is what we found. not everyone enjoyed using it. it is an amazing system, and i even let people next to me listen to it, but it is like, you have to be very sure of yourself to use that system as an artist. laughs. the music was very loud, you have to put that even louder, so it's going to be like... like you have nails in your ear. yeah it's really good, the sound is really clear, i'm not sure eltonjohn concert is the best concert to use it out because the sound mix is really good here. you heard the atmosphere around you, but in the meantime you are isolated as well. wooo! elton! exactly, like that. so, as innovative as this kit is, it may not be for you. you mayjust want to go to a concert and experience it organically. but having the option to mix your favourite artist while they perform in front of you, this might be a new direction in live music. drums play.

omar mehtab mixing music with the maestro, brilliant. and that's it for our audio tech special. hope you enjoyed watching and listening to it, and don't forget that throughout the week you can find us on facebook, youtube, instagram and twitter at @bbcclick. thanks for watching and we will see you soon. touch down, i pull the brakes and we run forward... oh! laughs. i tried running too soon! hello there. a soggy, blustery night will lead into a wet and windy sunday morning across many parts of the uk. on the satellite picture you can see this swirl of cloud, a developing area of low pressure that has been bringing some very heavy rain, some very strong and gusty winds,

and as that low pressure system slides its way across central and southern portions of the uk, through the first part of the day we will see some strong and gusty winds on the southern flank. this little lump of showery rain here could well include some very squally and gusty winds as it slides its way eastwards. now as we go through the day ahead, parts of the midlands, east anglia, wales, down towards the south coast will see a mix of sunny spells and heavy, thundery showers. persistent rain will continue to pile in across parts of northern england. northern ireland and scotland should brighten up with some spells of sunshine and just the odd shower, temperatures of 13—19 degrees. but where this rain lingers for any length of time, well, there certainly is the risk of some travel problems and some localised flooding. now, as we go into the evening, notice the white lines squeezing together on the back edge of this low pressure system. a swathe of strong winds blowing across some of these eastern coastal counties, combined with high tides, that could cause some coastal flooding. now, through the night, one or two showers pushing across the northern half of scotland, clear spells elsewhere

and the odd mist patch and temperatures will dip away. quite a chilly start to monday. but all things considered, a calm start to the day for the majority because of this little bump in the isobars, this ridge of high pressure. but it won't last long. here comes our next low pressure system swinging its way in off the atlantic. so as we go through the day, we'll see yet more rain pushing across many parts of england and wales. i think parts of wales particularly as this rain continues to pile up could well have some problems with flooding. the further north you are across the uk, more on the way of dry weather and just the odd shower. chilly here, though, 10 degrees in aberdeen, london at 17. and then we look ahead to tuesday, that area of low pressure churns its way eastwards, rain mostly for england and wales, some showers blowing into the north of scotland, some sunny spells here as for northern ireland. but those temperatures really dipping away across the northern half of the country, 9—12 degrees. and, as we push that area of low pressure away into the near continent, as we move into wednesday, follow the white lines, follow the isobars up to the north.

that is where our air will be coming from. a plunge of chilly air right across the uk for the middle part of the week. so even in the south, temperatures no better than 13 or 1a degrees. and for the end of the week, well, there's the chance we could see more wet and windy weather. machines that commonality.

this is bbc world news. i'm reged ahmad. our top stories: marking five years since the umbrella protests, hong kong's democracy movement takes to the streets for another night of clashes with police. five years ago the umbrella movement began on this spot. they gained no political concessions. that's why these people say their far more militant tactics are justified. votes are being counted in afghanistan after an election marked by low turnout and attacks on polling centres. special secrecy for president trump's conversations with foreign leaders leads to questions about his international dealings. and christian coleman, is the fastest man of the year, but there's controversy over his three missed drugs tests.