this is bbc world news. the headlines: at a summit in brussels, there's been disagreement about how to implement a deal to control migration from outside the eu, just hours after it was signed. france and austria have already ruled out hosting secure centres for migrants, a central plank of the agreement. donald tusk has issued a last call for the uk to lay its cards on the table. canada has responded to president trump's tariffs on steel with retaliatory duties on more than $12 billion worth of american goods. the canadian tariffs, which come into effect on sunday, target us steel, aluminium, and consumer goods ranging from orange juice to toilet paper. now on bbc news, in a few minutes it'll be time for newswatch. but first, here's click. britain's national health service

turns 70 this week, and it is struggling to keep up with the modern world. an increasing population who are living longer and have evolving health—care needs has led to not enough hospital beds, not enough access to specialised treatment, not enough nurses, and not enough doctors. one hope is to plug the gap with artificial intelligence. ibm's watson, for instance, fed with tonnes of information about cancer, may be better at diagnosing it than human doctors, and the hope is that it could be cheaper.

while some are sceptical that doctors can be replaced in this way, this week, one company claims that its ai is now better than a doctor. artificial intelligence has the potential to influence our lives in a way we cannot yet understand. nowhere more than healthcare, where decisions made by machines could mean the difference to life and death. hello, louise — how can i help you? at an event this week in london, babylon health claimed its artificial intelligence software can now diagnose illnesses better than the average doctor. i think i might know what is causing your symptoms. the company has already launched gp at hand, providing remote access to medical services in london. but the only involvement of artificial intelligence

here was an algorithm that runs you through a symptom—checker. you would still talk to a human doctorfor a diagnosis. now babylon says its software has written a work and pass a medical exam with a higher average grade than a person. what i found fascinating is that not only it performed as well as them, but in questions it had seen before, it had 98% accuracy. so once the machine learns something, it neverforgets. there are clear implications for this test for people in the world who do not have access to healthcare. since 2016, babylon have provided its healthcare service to rwanda in central africa. sub—sa ha ran africa has 11% of the world's population, but carries a quarter of the world's disease burden, and just as 3% of the world's medical staff. in rwanda, the country faced

a particular catastrophe with its healthcare system, after suffering one of the worst atrocities in the last century. over 800,000 people were killed injust 100 days in the genocide of 1994. this memorial in kigali is the resting place of over 250,000 people who were killed in the area surrounding the capital. the genocide touched nearly every person in rwanda, decimating humid resources. when the genocide ended, there were only 198 health professionals left for a population of over 6 million. it is difficult to overemphasise the challenges of rebuilding a society after such a tragedy. but today rwanda is regarded as an economic success story in africa. its president, paul kagame, has invited tech companies to the country to test ideas. first drones and now

artificial intelligence. we visited the offices of babylon, called ba byl, with the health minister. he is here to see a demonstration of how the artificial intelligence triage works. the company already has 2 million registered users and has the thousands of consultations. babyl is using the same chat bot that its uk customers would use, but there are several differences here. most people use feature phones, not smart phones. so the service is provided by a nurse, who reads the text over the phone. this is the symptom checker which would refer the patient to a human doctor. with long waiting times and long walks between homes and health centres, patients using the app and save a lot of time. can save a lot of time.

after speaking to the nurse via a chat bot, pacifique was able to pick up a prescription in about ten minutes. translation: you see? the service is easy. you can use at home and come to the hospital and they will see you immediately. babyl have employed several methods to get the message out there. they hold rallies around markets all over the country and do a lot of on—the—street outreach. many people we met were already signed up. some had appointments. translation: it is really good because sometimes you take a taxi and pay 600,000 rwandan francs, and when you reach the hospital, you find the doctor is not there. back in the uk, babylon and oust the performance of its chat bot versus human doctors.

it said its diagnosis rate was 81% on its first attempt, versus 72% for a human. they calculated that average based on five years of exam results. but the results have been questioned by some senior doctors, who've questioned the timing of the release. i would not, with the research that i do, go public on it, and have a big media event, before putting it through the scientific process, because i want to know that the reception i am doing is defensible, is rigourous, and that my peers agree with it. and i don't think we have been through that process yet. this important debate will continue as artificial intelligence becomes more prevalent in our daily lives. certainly critical to this is finding safe and rigourously tested ways to integrate the technology into routine medical care. deep in the heart of boston's jungle of cables, something stirs.

it is a cheetah. and it is off for a prowl. we are starting to see walking robots like this trotting out of laboratories all around the world. now the important skill here is not that they can walk a particular route autonomously — they are usually controlled manually using games controllers. no, the amazing skill here is that they can walk and balance as competently as we can, even on the most unforgiving of terrain. ok, that is impressive. that slips, loses its balance, and regains it. that is the important thing. whoa!

good shot! how hard is this? very, very hard. we move our body very easily, but we have to make sure that we know that we have three times for more neurons for muscle movement than your actual forebrain. we have 700 muscles. we are trying to mimic this with using only twelve motor. still pretty ha rd. how close are we to robots like this being practical? what do we need to get right? i think we're pretty close in of mobility, close in terms of mobility, like walking around, climbing upstairs, turning. the hardest challence is still using arms. i sent this to power plants with regular radioactivity. opening doors is difficult. that is where autonomous control fails easily. so we are thinking about combining

human manipulation combined with nearly autonomous navigation. our motors are different from those you find in a factory. those cannot handle impact and absorb energy. as you can see, our robot is landing in jumping by itself. they certainly can, as demonstrated by this exclusive look at a previously unseen manoeuvre. you cannot hear it, but our cameraman swore there. it wasn't pretty. but the thing is, it

recovered and stayed upright. i know people who could not handle the recovery there. finally, with wimbledon starting on monday, i thought i would get in some practice on a court. and, of course, i brought along my robot buddy. it autonomously patrols the court and collects the balls you lobbed, smashed, or in my case, mishit. for any ball boys and ball girls, worrying about their jobs, do not worry. this is about people who are practising in two are not very good. you can carry on practising. it will pick them up while you are busy being rubbish. its on board camera spots the balls and the partner at the net keeps track of things too.

it also has a handy and detachable basket. you can take it to the car and no one will ever suspect that you are the laziest tennis player alive. and that is it for this week. the full—length version is up on iplayer. we're hanging around in the us for another click next week. join us for that. in the meantime, you can join us at bbc click. from my robot buddy and me, see you soon. hello and welcome to newswatch. as thousands protest against leaving the european union, we examine the challenges of reporting on brexit in an objective, comprehensible

and interesting fashion. and... who's your favourite couple on love island? and we find out why brussels correspondent adam fleming was faced with that question from an unusual guest on the daily politics programme. this week's european council meeting had been seen as a crucial staging post in the protracted negotiations over the uk's departure from the eu. as it happens, the growing political disagreement over migration dominated the agenda. but, as ever, brexit was under discussion as well. amid all the disputes about migration, theresa may had had just a brief chance to talk to the assembled leaders about brexit. her message to them? we are ready to intensify and accelerate the pace of negotiations. i want to see that from the european commission, and the european union, as well. but, more than a year into the negotiations,

the eu says the uk still doesn't have a clear negotiating position, and it needs to see one. she headed home, excluded from today's brexit discussion. controversy has of course accompanied every stage of the brexit process, including the way it has been reported on bbc news. for many, the corporation fails to provide balanced coverage, with louise vale putting it like this... but the majority of complaints we received are about a perceived bias in the other direction. here is pat marks.