the us is closing its borders to all but essential travel from saturday. the move has been agreed with canada and mexico as part of efforts to stop the spread of the coronavirus. elsewhere, stock markets in new york have closed down sharply again. in the uk, the government has announced unprecedented measures to tackle the economic impact of the coronavirus — as the prime minister says restaurants and pubs must close. italian authorities have announced that the country's death toll from the virus has jumped by 627 in a single day. they're reported to be about to close public parks and limit the areas in which people can take exercise. in spain the virus has claimed another 235 lives. its worst number yet in a single day brought the country's total fatalities to above 1,000. now on bbc news, click.

this week: the race to trace the coronavirus. the pop—up groups are trying to help us all get through it. and we've, helping children to use meditation. as the coronavirus has swept across the globe, the ability to know exactly where it is has become the crucial key to stopping it. we have a simple message for all countries,

test, test, test. some countries have really cracked how to do this. south korea, with its drive through ten minute tests, is held up as a model for others to follow. but many countries are struggling to test at scale. in the uk, testing is having to be limited, the cost to infrastructure and the time of the test ta ker all infrastructure and the time of the test taker all holding up the battle against the disease. now, there are dozens against the disease. now, there are d oze ns of against the disease. now, there are dozens of efforts going on around the world to try and solve this. and jane has been looking at wonder close to home in west london. around the world, companies and increasingly individuals are racing to find ways to accurately test people for the coronavirus. the situation is changing daily, if not hourly. we simply don't have mass testing available for the population i'iow testing available for the population now and there's a big effort going oi'i now and there's a big effort going on to try and get that in place as quickly as possible to be able to

manage this. were negotiations today to buy a so—called antibody test, simple asa to buy a so—called antibody test, simple as a pregnancy test, which can tell whether you have had the disease. there are two types of test being worked on. diagnostic tests, which identify people who currently have coronavirus, and antibody tests, these look for antibodies in the blood to see if a person ever had the virus in the system and if they did, when. the diagnostic tests are primarily based on a technology called is pcr. this is a standard molecular techniques that identifies the genetic material of the virus from a throat or nose swab. special emergency use authorisation from the american food and drug administration has enabled to make companies to ramp up commercial testing efforts in the us. 0ne companies to ramp up commercial testing efforts in the us. one is swiss company which uses its clovis

machines already in many hospitals across the country to increasing people who be tested at once. the other is thermo fisher which uses its applied by a system pcr insurance. the company aims to produce 5 million tests for these machines by early april. but it is not just machines by early april. but it is notjust big machines by early april. but it is not just big companies machines by early april. but it is notjust big companies getting involved in testing efforts. in west london, a community of open source scientists, engineers and microbiologists working out of shipping containers in the open cell viability are trying to help. there are 70 shipping containers here with love looking at a range of biotech challenges from personalised medicine to dna sequencing, to buy electronics and biomaterial. it's shared me like you are biology lab has been transformed to excrement with expanding testing capacity while also designing a portable lab solution built out of a shipping container that could be easily transported. were trying to use these alternate methods to speed up

these alternate methods to speed up the testing kit because in order to test large populations, we need to be millions of covid—i9 testing kits. west company has donated two of its liquid handling machines to the lab for their work. these plates can the lab for their work. these plates ca n test the lab for their work. these plates can test up to 96 samples at a time. these are too afraid diagnostic tests like the ones we saw with other companies. these open source rather than proprietary and they say they would like to get the cost of testing it down to five to £10 but as. here in the uk, having is really about getting into that nhs pipeline, being able to augment someone's existing pathology department. and being able to say, look here is the molecular allergy kit. the same one person could do 96 tests when they are doing one anyway. if it receives regulatory approval, lab could theoretically be set up with just three machines inside a shipping container. as i was being able to augment existing pathology labs around the country, a shipping container set up could help people in places with far less

access to medical facilities. they say is only useful for the uk but it will definitely be useful for other countries. it can also be something that can be reused in case anything like that happens again. there is also a long—term that will be there really. there are other test being developed in the uk. you embassy of leicester is working on a facemask test using money from research england and partnering with the nhs to reverse a test using thought tobacco laces. by wearing a facemask for 30 minutes with 3d printer trips inside, it can show whether the person is breathing out the virus. sciences at the university of oxford say they have developed an ultrasensitive test that can work in just 30 minutes. they say it doesn't need the kind of machine used in the other tests and can be deployed to rural or remote areas quickly. they also say it is sensitive which means it can detect if someone is in the early stages of the virus which could help slow down transmission. detecting the virus in the early

stages in an asymptomatic carrier could indeed be changing and halting its progress. getting more tests out to as many people as possible as soon to as many people as possible as soon as to as many people as possible as soon as possible could provide the data needed to accurately track the virus. that was jan and it will be fascinating to see how that story develops. pretty quickly, i would imagine. now, with countries around the world battening down the hatches and looking down huge swathes of the population, everyone is hoping to make a plan for how they're going to live through this. technology will play a massive heart and stephen beckett has been meeting the pop—up groups were trying to do their best. following the footsteps of china and other countries around the world, many people in the uk are now being asked to stay at home self—isolate entirely stop particularly, if there are in an at risk group. that isolation poses its own challenges

from getting access to the basic necessities to looking after your mental health. while, last week, p°p‘up mental health. while, last week, pop—up online communities have appeared to try and help solve some of those problems. this is the covid—19 mutual aid network. x1 of those pins is a local group pledging to help people in their community isolated by covid—19. and believe it or not, just a few days ago, none of them existed at all. in less than a week, the movement has snowballed into an entire improvised volunteering infrastructure. i'm so surprised by how much it has grown since then. now there are more than a seven or 8000 local people involved. every single ward in london seems to be covered in a what's up group where folks are looking to volunteer or connect with other people who need help so it is phenomenal. at the moment, the real heart of all of this is something quite basic, it is groups on whatsapp. these are just a few of some of the ones i've joined whatsapp. these are just a few of some of the ones i'vejoined in whatsapp. these are just a few of some of the ones i've joined in the last few days and already they've

got hundreds and hundreds of m essa g es got hundreds and hundreds of messages from people offering their help in trying to get involved. 0bviously, help in trying to get involved. obviously, this is to surround me but i'm told similar groups are p°ppin9 but i'm told similar groups are p°pping up but i'm told similar groups are popping up all across london and in some places around the uk. beyond whatsapp, groups are using open access tools like google docs, sheets, and forms to bootstrap a whole volunteering infrastructure out of nowhere. all that organisation is essential if the groups are going to reach more people in the community who may not be looking for support online. it is about 9am and i'm in an estate in central london waiting for a few members of the local group. they are planning to visit every schoolhouse in the estate this morning. the idea is if anyone needs help, some suppliers brought to the door someone to talk to for a bit of support, and they know they have someone they can call.|j support, and they know they have someone they can call. i think this isa someone they can call. i think this is a really scary and anxious time but the best way forward is everyone

coming together and what an amazing time to discover your neighbours. when we going to be shut up in our neighbourhoods. i think it is grown so neighbourhoods. i think it is grown so quickly because, actually, everyone feels like a bit of a loss of what's to do and how they can help right now. i think it is kind of thinking, well, we feel 0k perhaps, but what about the others who are struggling. social media has pros and cons, this is why massive pros and cons, this is why massive pro that we can now unite online. given social distancing, we can now co—ordinate and plan remotely and get together and also give each other support. it's really important that we don't feel isolated at the moment, although we are physically. actually connecting via social media and bringing the community together is really helping to combat loneliness. the wider group a to point out that they are not medical professionals, nor is it an official charity. this is a volunteer community effort trying to do small things to help. does that mean the

goodwill could be exploited 7 things to help. does that mean the goodwill could be exploited ?|j things to help. does that mean the goodwill could be exploited? i think it is still a little bit tricky and dangerous at times because the wrong m essa g es dangerous at times because the wrong messages can be sent and we are struggling with that little bit as well. some misinformation orfake news being passed around which is just not helpful. it is such early days for projects like this so it is not clear yet just how days for projects like this so it is not clear yetjust how much impact p°p‘up not clear yetjust how much impact pop—up volunteering communities could have but done safely, it feels to me like a good idea and a world of good news. hello and welcome to the week in tech. it was the week amazon stopped stocking all non—essential items from its warehouses following the demand from household necessities during the coronavirus pandemic. apple was served a record breaking 1.1 billy dollar fine by the served a record breaking 1.1 billy dollarfine by the french competition authority for anti—trust practices. it was found to have an unfair agreement to control prices

with two french wholesalers. and the us department of health and human services were hit by a cyber attack in an attempt by hackers to slow down its response to the coronavirus pandemic. how would you feel if your favourite social media accounts called you ugly? it was a real this week by the intercept that video sharing act tiktok instructor moderators to suppress posts created by users it deemed too ugly, poor or disabled. macro presidential goal was to prevent bullying and the guidelines change. if you thought gaming and reading were incompatible activities, think again. the uncensored library was created on mine craft by design studio block works. and creates censored journals and articles which are banned in several countries as a way of avoiding press censorship. and finally, if you are concerned about who is preparing your lunch, there's a robot to help with that. this robot chef in tokyo, japan, has been cooking up needles for customers.

however, the kitchen robot does need a little human help to combine the needles with rough and vegetables. rum and to that. —— ramen. over a million children in the uk are suffering from asthma. a recent report suggests that 94% of all sufferers aren't using their inhalers correctly. but it seems there could be some technology that is coming to the rescue in the form ofan is coming to the rescue in the form of an augmented reality up. i've come to the church of england primary school in suffolk whether been trailing the app on both pupils who do and don't suffer from asthma. let's press play! the aim of the app is to create a fully immersive experience to learn about asthma and the triggers and at the same time, it dammit fires improving inhaler technique and is centred around two

inhalers here both providing treatment, one of and preventative and the other to be used in the case ofan and the other to be used in the case of an asthma attack. hello, i'm here to talk to about asthma. someone who has asthma will have symptoms like coughing and wheezing stop what we need is a rescue inhaler stop otherwise known as a reliever.|j need is a rescue inhaler stop otherwise known as a reliever. i was quite enjoying that but more importantly, i'm joined by quite enjoying that but more importantly, i'mjoined bya quite enjoying that but more importantly, i'm joined by a few of the first uses of the app. freddie, jasmine and john. this looks like a game of pairs, what learning from this element? each card will have something that could happen if you don't use your inhaler. this once as, coughing. i have learnt how to use the inhaler and what the difference inhalers are called and what can happen if you don't use the inhaler. well done, you found all the cards? issues with not using inhalers properly is that we see a

much higher incidence of emergency admissions with acute asthma attacks and also chronic infection occurring and also chronic infection occurring and actually asthma deaths still happening. how useful do you think this is to somebody who doesn't actually suffer from asthma? this is to somebody who doesn't actually suffer from asthma ?|j this is to somebody who doesn't actually suffer from asthma? i think it can be very helpful in case, you have a friend or family member and is no—one else there. and they have an asthma attack. you could find their inhaler and find out with it. and how about you jasmine? because you do have asthma i know and how useful have you found it? it really helps if you want to learn how to use your inhalers and use your inhaler properly, because then your inhaler properly, because then your chest will go funny if you don't. an issue is if children use an inhaler directly on their mouth they will inhale too quickly. the inhaler technique is poor. effectively, you may is sprayed up

in the airand effectively, you may is sprayed up in the air and take a big breath in. fact: asthma symptoms are often worse at night and during exercise. what do you think of the up? like freddie said, it's great for people with a without asthma because you could get it at any point of your life. so even if you don't have it now, you could have it later. the interactive part of the app here is what is key and the game application. we know children learn through technology now, that's the way it is. during an appointment, we would love to have more time to spend with them but what they can do with the app is take it home, learn in an environment they are comfortable in and learn at their own pace. all three of them looked totally glued to the tablet. the knowledge gleaned from this ar game could save lives. i hope you enjoyed the video. that's all i have to show you hour. that was lara with a remainder there are other conditions which need managing. lest we forget.

so, earlier we looked at how social media is allowing people to come together to help solve to get through the covid—19 outbreak. we have a different tale now of how technology can in small ways help chip away at poverty and hunger. david reed has been simmering by to see an app which is co—ordinating free food to the city's poorer. mumbai mastered food delivery almost a century before mobile phones have does make were invented was that they been fitted in schools and in movies. now they are among the lead actors in another story centring on an app to feed mumbai's hungry. a fascinating enough sale on its own, but for the extraordinary life stories of the other people behind the app. i met up with navin, who

eight years ago had an appalling car accident in hong kong.|j eight years ago had an appalling car accident in hong kong. i had a grass andi accident in hong kong. i had a grass and i didn't know i had a crush. he lingered in a coma for months. when he finally woke up, his outlook on life had changed. after spending five months in the hospital, i was given the chance to live again. and i had to ask myself the question, what is the difference i have made asa human? what is the difference i have made as a human? navin put his head towards one of the biggest issues of ourtime semi —— towards one of the biggest issues of our time semi —— issues of our time: inequality. mumbai has a visible disparity in wealth. but how do you get that oversupply, that access, into the hands of those who really need it? —— excess. navin teamed up

with another person who cheated death, a cancer survivor, darshan, to develop another app. you see someone who needs food, you take a photo, then you pose the location. you can then broadcast that within the group, with people who are in the group, with people who are in the vicinity. the target also carries other details, local landmarks, how many live at the address, the kind of thing. now, you can meet the needy yourself or be like the group and find someone on the app who has got something to give. this restaurant cooked a little too much this lunchtime. they've put it on the app, so food

that would otherwise go to waste is picked up. they scanned the app for someone nearby who needs it and they hit the road. this woman has six mouths to feed, she says they usually eat just once mouths to feed, she says they usually eatjust once a day so they are super happy to have an extra meal today. she says the kids loved it. incidentally, the geo— tag can only be removed by someone at that location. so once the need is met, the fly comes down. it's kind of like pokemon go, giving is becoming a game. the giving starts from the time you start identifying the need. the app awards points to the users and the dashboard reflects the subtitles in the city. it's like competitive philanthropy?” subtitles in the city. it's like

competitive philanthropy? i wouldn't call it competitive but i would say it is encouraging and rewarding people to see the good they have done. goodness and contagious nurse. the app is onlyjust off the ground and there have already been thousands of meals delivered. the developers are planning on tweaking the app to deal with natural disasters. that was david reed in mumbai. right. who's up for a disasters. that was david reed in mumbai. right. who's upfora big dollop of escapism? yeah, aha? i thought so. avengers: endgame is pretty ha rd to thought so. avengers: endgame is pretty hard to beat in that respect stop and we've been behind—the—scenes with matt aiken, visual effects supervisor, to see how they brought the film's climactic battle to lie. warning, this will contain spoilers. but if you haven't seen it yet, i imagine

you haven't seen it yet, i imagine you would be streaming in the next few weeks, actually. dabbawala did exactly what he said he was going to do. he wiped out 50% of all living creatures. i work on the end battle and that encompassed all of the aspects of modern digital effects work. we had lead digital characters, we had giant battle scenes with entirely digital armies, the battles taking place in an environment that almost entirely digital, lots of complex simulation work with destruction events and fire and complex, you know, the superpowers often involve simulation work. digital doubles are like 47 lead marble characters for those wide battle sites. so a fantastic space to be working on. i think the way that marvel, they keep these

personal. those wide shots are a few and far between. we don't spent a lot of time in that space and we are quickly drawn into individual conflicts and battles. all of the emotional lines that are playing out this multitude of heroes coming together on this battlefield. don't haveit together on this battlefield. don't have it can be blocked out quite early on but there are pieces of the puzzle that were about tidying it allup puzzle that were about tidying it all up stop the sequence was entirely found within the studio —— wasn't, it was him with a green screen on stage but depending on how it plays out we might change the set pa rt it plays out we might change the set part of the environment and in just keeping the actors' face. we welcome the opportunity to replace the environment in that way because it liberates us to take control of the lighting of the scene in many ways. we like to get things over the render, but some of those big battle shots, thousands of digital extras, complex relation were going on, yamaha, there are weeks of rendering if you look at it in that way. we do

have a big renderfarm so if you look at it in that way. we do have a big render farm so we got it all through. there was a huge amount of pressure. this was the culmination of 22 films, and not to muck it up! was what everyone was feeling. so there was a huge amount of focus on doing justice to this whole huge arc of storytelling. this is the fight of our lives stop this is the fight of our lives stop this is going to work, steve. is the fight of our lives stop this is going to work, stevelj is the fight of our lives stop this is going to work, steve. i know it is. because i don't know what i'm going to do if it doesn't. is. because i don't know what i'm going to do if it doesn'tlj is. because i don't know what i'm going to do if it doesn't. i don't know about you, but i really needed that. and that's it for this week. don't forget that you can always find us on social media these days for obvious reasons. tell us what you're doing to get yourself through the current situation, and we may put some of your suggestions on the air. and why not check out our massive back catalogue? it's on the iplayer in the uk and on youtuber

everywhere. you're on facebook, instagram and twitter, too. thanks for watching, be safe, and we'll see you soon. hello there. there was a little bit more in the way of sunshine to go around on friday and it really turned out to be quite a glorious day across many areas. this was the scene in cockermouth in cumbria. thanks to trevor for sending that beautiful weather watch picture in. you can see the extent of the sunshine we had. further south, we had this weather front with us again and it continued to bring some dull and damp weather into the very far south of england and even into the early afternoon, there was some light rain reported in hastings in east sussex.

now, overnight tonight, many of us will have dry conditions. the breeze keeping the frost at bay across many south—eastern areas but the further north you go with those lighter winds, we'll see temperatures dip well below freezing. that said, there are just a few showers dotted around as well across the hills of southern england, across the hills of north—east england too but for most of us it is a dry—looking picture. for the weekend, this area of high—pressure, this area of low pressure not really changing very much. just a shuffling of positions a little bit more and that means the winds are going to switch from a easterly to more or a south—easterly direction. but that is still a cold wind that will be blowing and making it feel pretty chilly out and about, particularly in the morning. some patchy cloud around as well, cloudy to start the day across western areas, quite high cloud and a nice sunrise for some of you. the winds will make it feel cold and those winds will be at the strongest across the hills and western coasts of wales and across the moors and coast of south—west england. gusts of 40, perhaps even 50 mph in one or two areas, which will make it feel quite

chilly — certainly knocking the edge of the temperatures. i suspect we will have some areas of cloud in the north sea affecting eastern areas of scotland in particular. we might have some of that both in the morning and the afternoon. it won't be nice and sunny everywhere. 0n into the night—time, saturday night: we could see some patchy cloud coming in from that north sea but when winds do manage to drop out, we could well see a slightly more widespread frost. a colder start to the day on sunday but then that said, the winds will be blowing a little bit less strongly on sunday so probably won't feel quite as chilly. there will be quite a lot of dry weather and sunshine to around. perhaps some slightly thicker cloud edging into the scottish highlands and threatening an odd light shower but for most of us another fine looking day. temperatures between eight and 12 degrees. a little bit cool with onshore winds on the eastern coasts of scotland and england. into next week: the area of high—pressure still holding on but we see this weather front starting to slip in across the far north—west. monday looks like being another dry day with sunshine. then we will start to see some rain approach the far north—west as we go from tuesday and wednesday. that is your latest

weather, bye for now.

welcome to bbc news, i'm simon pusey. more us states are ordering everyone but essential workers to stay at home, to try to slow the spread of the coronavirus. illinois, connecticut and new york made the announcements on friday. nada tawfik reports. from california to new york, an eerie emptiness across america's normally bustling urban centres. in the age of social distancing, people are avoiding hotspots in hollywood and the big apple. after a week of tightening controls, officials announced even more measures to combat the spread of the coronavirus. in the golden state,

a stay—at—home order went