cyber attacks have been reported on organisations in more than 70 countries. computers in thousands of locations have been locked by a programme that demands a $300 payment to restore users‘ access. companies, individuals and public services including hospitals have been affected. the white house has refused to confirm or deny whether president trump recorded conversations with james comey — the man he sacked as director of the fbi. in a tweet earlier, mr trump warned mr comey not to leak stories to the media, saying he had "better hope there are no tapes of our conversations". francesco schettino, the former captain who crashed the costa concordia cruise ship, has reported to prison to start a 16—year sentence for his role in the disaster. italy's highest court upheld the sentence — marking the end of the country's appeals process. now on bbc news, it's time for click. this week: regenerating keys.

unusual vegetation. and goodness gracious, great balls of fire! —— teeth. energy. as our demand for it grows, the world is faced with a challenge. when we burn coal, the energy that has been stored inside for millions of years is released, to power our cities and machines. but so, of course, is all the bad stuff that is polluting and changing our environment. countries have met and

agreed to reduce carbon emissions and invest in cleaner energy solutions. we are harnessing more solar and wind energy than ever. and last month, the uk had its first day of electricity supply without burning any coal. but green power is still a long way from taking over from fossil fuels. but what if there was a clean energy source that could rest release —— release ten times the energy of fossil fuels, an almost limitless supply they could keep the planet running for millions of yea rs 7 keep the planet running for millions of years? well, it turns out that. and answer lies in the stars. in the heart of the sun, under intense pressure and heat, hydrogen atoms change from gas into superhot plasma, and in this burning soup, beef used together, forming helium, and releasing amends amounts of

energy. this is nuclearfusion. and this is what scientists have been trying to recreate down here on earth. —— being fused. trying to recreate down here on earth. -- being fused. we have to do something similar to a star, which has gravity. to do that, we use magnetic fields. we are talking about magnetic fields that great more pressure than the water pressure at the deepest part of the ocean. so you have this huge pressure trying to compress the plasma, and you need to hold it in place for a long time as well. to get more energy out. if you can keep that superhot plasma in place for long enough, the energy released can keep everything hot, without the need for external power. the fusion then becomes self sustaining. and thatis then becomes self sustaining. and that is when the magic happens. and that is when the magic happens. and thatis that is when the magic happens. and that is also the hard bit. we are making progress, though. we have

already achieved fusion. and some of the best fusion happens inside machines called tockermac. this one is just machines called tockermac. this one isjust outside machines called tockermac. this one is just outside 0xford, which turns out to be a bit of an epicentre for fusion technology. the world's is just 15 minutes drive up that way. —— tokamak. the problem is you need to put more energy in then you get out. which is not ideal. but the company here is taking a different route. this is the lab of tokamak energy, which is generating relatively small tokamaks. the designs are being refined. this approach means that the team may be the first to work out how to produce a net gain of energy. go on then,

fire it up. that is a fusion reaction! insight here, we are generating a gas with electricity flowing through it, and we are going to fuse atoms together, joined together, and generate fusion energy. —— inside here. together, and generate fusion energy. -- inside here. and this is not even fusion, this is just a warmup for the next age, which is hoped to happen next year. what we will do is heated up to over 10,000,000 degrees, up towards 100 million degrees. what will that look like? we won't be to keep our face this close, because it will get damaged! will have to be further away, outside a concrete barrier. but it will start to go transparent as the plasma gets really hot, ten times the coverage of the sun, 100 times the coverage of the sun, 100 times the coverage of the sun, 100 times the director of the sun. once they have achieved the temperatures, they have achieved the temperatures,

they need to keep the plasma in place long enough for it to become self—sustaining. —— the temperature. this is what the team hopes will create magnetic fields from hour to do that. is of thick copper cables, a strip of superconductor meed of each room barium copper oxide. all this sounds hopeful, but the joke each room barium copper oxide. all this sounds hopeful, but thejoke is that nuclear fusion has always been 30 years away. —— itrium barium. if successful, it means the end of our reliance on fossil fuels, there is a lot of science to do between and then. it could be a fantastic source of energy. likely to be the most important source of energy in the 22nd century. the point is we need it now and so we want to make faster progress towards fusion energy. well, these guys try and recreate the conditions at the centre of a star. let's talk for a few minutes

about capturing energy from our son. solar energy. it turns out that india is in the grip of a solo gold rush. money is pouring into the country to build solar power plants to try and cater for the skyrocketing demands from about a billion potential consumers. —— sun. we sent a correspondence to tamil nadu. —— correspondent. follow the morning sun for two hours out of tamil nadu, and it takes you to a world first. the planet's largest solar power plant. it is huge. ten square kilometres of glimmering

glass and electronics, stretching as far as glass and electronics, stretching as farasa drone glass and electronics, stretching as far as a drone can see. the power company here through $700 million into building the community plant. and they did not hang about, up and running injust and they did not hang about, up and running in just nine and they did not hang about, up and running injust nine months. but it is big when it comes to solar power. 0rare the indiansjust is big when it comes to solar power. or are the indians just showing off? the answer might be in the clouds. if you look over there, you can see there is a gathering storm. this is one of the problems with solar power. if the rain comes, there is too much cloud and the output is drastically reduced. but the sheer size of kamuthi means this is less ofan size of kamuthi means this is less of an issue. this is covered in 2500 acres of panels. with cloud, only

five or 10% reductions occur. normally, we can predict in a year generation for the maximum of ten months. 0nly generation for the maximum of ten months. only two months there will be variations. each of these panels generates 310 watts of energy. 30 watts is enough for a domestic light bulb. 220 for a laptop computer. they plasma tv screen, that is 330 01’ they plasma tv screen, that is 330 or 350 watts. there are 2—and—a—half million these panels. —— these panels at kamuthi. —— of these panels. kamuthi's estimated to make a enough power for three panels. kamuthi's estimated to make a enough powerfor three quarters of a enough powerfor three quarters of a million people. they are squeezing every last drop of energy out of

whatever sun is available. by facial panels even generate power from light that bounces back from the ground. —— bi—facial. 0rsnow. not that there is much snow in india. where water is scarce, washing dust covered panels can be impossible. an israeli company has developed a robot that drycleaned the panels so they get a regular dusting. as the

light fades, so does the power generated. until they have the batteries to store something like the 648 megawatts kamuthi producers, solar in india won't replace dirty coal, be noxious gases from which pollute the country and the rest of the world. it is certainly getting cheaper. this week, wholesale prices of solo dropped below coal for the first time. —— solar. bids are in to construct first time. —— solar. bids are in to co nstru ct a first time. —— solar. bids are in to construct a bigger plant then there is further north in andhra pradesh. but until then, kamuthi, the largest

solar plant on the world, will make the most of its place in the sun. hello and welcome to the week in tak. it was the week that microsoft released an urgent software update after discovering a floor in their operating system. the bug could give hackers accessed by simply sending an e—mail which did not even need to be opened. a 16—year—old's tweet about chicken nuggets became the most retweeted ever. and customers in the uk were told there would be no more roaming charges in european countries as of next month. take a look at the solar panels. kaesler‘s solar roof tiles are now available. look pricey? well due to the power harvesting abilities, they are being pitched as cheaper than conventional tiles. from solar to sonic. a us

plane return to earth after two yea rs plane return to earth after two years in space. but its mission remains top secret. having landed at the kennedy space centre, or the pentagon declared was that it was performing risk reduction, experimentation, and concept of operations development. intriguing. and finally, hollywood quality animation comes to the masses. 0k, well not quite. the smart suit pro tracking system costs a fraction of the pro— kit. but at 2—and—a—half million dollars, it could prove gaming changing for many. —— smartsuit pro. it is one of the biggest fundraising events of the year. biggest fundraising events of the yea r. lost biggest fundraising events of the year. lost funds are still being counted, organisers are hopeful the

records from last year's london marathon will be broken. 0nline fundraising platforms play a big role in attracting donations, pushing causes to users, was also allowing them to donate money were just a click. just giving, one of the biggest players, raised just under £350 million last year. this isa under £350 million last year. this is a figure that charities might not have been to raise without the help of these sites. but these are big business. justgiving takes 5% commission. while others, like globalgiving, take up to 15%. they say the fees cover operational costs and innovations to ultimately raise more for charities. but for charities, this commission is money that is not going towards their causes. the majority of our funding comes from individualfundraisers, for example one of our runners is currently on £1500, so the commission

on that is going to be about £100. and, on the ground, that translates into care for ten kids that could have received top to toe checkup, hiv testing, atv testing. and be insured their health and well—being. so it makes a huge difference. starfish is a small charity which helps vulnerable children in south africa, who are affected by hiv and poverty, and a lot of its money goes into running a mobile health clinic. in the uk, the charity big kid helps vulnerable young people in south london to gain leadership skills. both organisations have been experimenting with kind link, a site which promises to give charities although collected donations and will not make its money from commissions. i went to meet its founder, iskren kulev, who traded in corporate life and set up a home office, just south of the thames. kindlink didn't start as a company, kindlink started as an idea to be a social enterprise/charity that helps charities. for him, it's all

about transparency — he wanted to create a platform where charities would post updates. the biggest problems of the charities is how they communicate with their donors and do the donors trust were the money is going? about 70% of donors say they would make more if there —— they knew what was happening with their donation. they have also added a feature to show people how much money the charity has received and how much it has spent. how has your background in financial tech helped you to put this together and also to work the system a bit, because it is all about making money, it is about making money now not for businesses but for this. it is always a matter of negotiation, i would say. i will go firstly through volume is important, how you present volumes to your providers. when i know where they can make a compromise, i can try to come up with a deal which would work for both of us. see, this is a guy you want on your side, because he knows how it all works behind—the—scenes.

and so far it's proving successful, with more than 170 charities signed up. how would you improve on what you are doing on the pitch? for big kid, it's been able to spend more money on its programs, like this one, which trains young people to be football coaches. it has helped me, definitely, especially with school and stuff like that. like, in school, i wasn't the good kid, you understand? so how does kind link cover its costs? well, instead of taking commission from donors, it plans to take the money from businesses. they've developed this platform for companies to build a profile for themselves, showcasing the good causes they support while building the brand name. and the companies will be charged a monthly fee. i think it is quite fitting that kind link have set themselves up just across the river from canary wharf, where the financial industry makes its billions. and i think it takes a certain kind of person to give all of that up and come over here and work for charities. that and a small canoe!

what's being created here in this lab at the university of nottingham could mean that you will be making fewer trips to the dentist in future. they're working on fillings that heal your teeth! whilst they can't actually make a tooth regrow, they aim to encourage the dental pulp stem cells within the tooth to transition into a new healthy cell type. goggles on and time to talk to one of the lead researchers on the project, adam. add, can you tell me a bit can you tell me a bit about what you are doing here? yeah, so, we've developed a dental material technology that has been used to restore components of a patient‘s tooth. this is the material we have here, in its solution form, and once uv light is irradiated

on this solution, it stiffens into a rigid plastic or a polymer. the substance created is used in the same way as a conventional filling, but the aim is that it will interact with the dental pulp beneath to heal it as well as prevent further rotting. perfecting the product involves precision and patience. the materials go through many stages of testing. 0nce solidified under a uv light, it is off for its next challenge. is the idea that it will heal all the way up to the point of the filling, so you have a totally healthy tooth remaining? the healing process will only occur if the material is in contact with the cells we screen for, so we have to place this material in contact with the pulp tissue and the pulp tissue contains the cell population, the stem cells, that we are trying to engineer for regeneration. what does this mean for your average person who goes to have a filling? potentially, if a person has severe dental decay and they need a filling, or if it's severe enough they need a root canal, potentially, this technology can be used

as an intermediate approach, where we can intervene and reduce the incidence of people needing root canals. the substance is designed to be used in a similar way to current fillings and is hoped to be available within ten years after various trials and approvals are achieved. and they're not the only ones experimenting with regenerative dentistry. kings college have been working with an alzheimer's drug, aiming to regenerate stem cells, something which could be ready even sooner, in five years. but whilst the wait for what we saw in nottingham may seem long, i am told the materials are cheap, which indicates that if this does becomes a reality, it will do so for more than just the elite few. now, over the last few years, we've reported from silicon valley, as marijuana has gradually been decriminalised in several places across the us. the tech companies in the area have

been quick to try and capitalise on changes in the law, but there have also been some unintended consequences. for example, it turns out there is no reliable way to test whether a driver has been smoking pot. well, as we report, nanotechnology that has previously been used to help detect cancer may now be used by police officers to help keep the roads safe. american police officers are facing a problem with pot as more states legalise it. how to crack down on driving while drugged. we asked the mountain view police department to explain the standard procedure to test for marijuana use. there isn't one. it all depends on whether or not we can smell something. federal law still states that smell alone can allow an officer to investigate further. there is no quick roadside test. pot behaves differently

in the body than alcohol. the difference between you and i breaking out alcohol is minimal, whereas, in marijuana cases, it rapidly leaves the body. at the end of an hour, up to 90% of the marijuana in your system will have been broken down. the police department hopes stanford university can help, scientists there are working on a ‘potaliser‘ — a device which will detect levels of thc, the psychoactive ingredient in marijuana. we have an array of 80 sensors. you can think of each of those sensors as a magnet. and when a chemical reaction occurs, that indicates thc is present, then a magnetic nano particle causes that magnet to flip its polarisation. it's a lot like a computer hard drive, where you have zeros and ones that a read head can read. for us, rather than having a computer flip it from zero to one, we have a biochemical reaction flip it from zero to one.

the potaliser tests saliva collected with a swab. it can send results to a mobile device. this is the first attempt at turning the technology into a hand—held device. in a year's time, the scientists want it to be easy enough to use for police officers in the field. i stop you, you blow into the machine within 15 to 20 minutes of the stop and it tells me your nanogram level right then. 45 minutes later, get your blood drawn, and it is lower. at least i have the original, at the time when my car stopped, you were at this level. and that will help in the prosecution later on. ultimately, researchers want the potalizer to work faster, cost less and it should work on people. yeah, that last requirement is key! because stanford receives us government funding, it must comply with federal drug laws, so potalizer is yet to be tested with humans.

the researchers hope it can edge out competing devices, like the thc—detecting breathalyser from hound labs. marijuana use may rise as loser laws take effect, but the right tool could help police the streets safe. just before we go, a little tease about next week's clip, —— click, which is going to be rather epic! can't wait! that's next week. in the meantime, follow us on twitter, and like us on facebook, too. you can see loads of extra content on the facebook page

every day of the week. thanks for watching and we will see you soon. hello. showers or longer spells of rain were the mark of the day on friday in many parts of the british isles, but other areas too got away with a decent sort of day. that was the end of the day in kings cross in london. that was the day in cornwall. what's driving things at the moment? this area of low pressure, sat in the middle of this swirl of cloud. you can see the persistent rain showing up, and those with a good eye can see the showers, some of those were quite sharp. as we get on into the body of saturday, rather than friday,

the same area of low pressure has drifted a little bit further north, taking the prospect with it of those longer spells of rain. not a cold start to the day wherever you're starting it. the temperatures just about dipping away into single figures, across a rather murky north—eastern quarter of scotland. but further south, across the greater part of southern england and wales, it's not wall—to—wall sunshine, but it is mild as you step out the door first thing perhaps, and a lot of dry weather too. you've got to start moving towards the north—west of wales, to northern ireland, the north—west england and up into the heart of scotland, where you are in the centre of the low, and you will see more cloud, thick enough for some rain and further north and east it is a cooler feel, with a noticeable south—easterly wind there and a lot of low cloud. it's going to be one of those days i'm afraid in that neck of the woods. but let's not major too much on the rain and showers, because, across a greater part of england and wales, yes, isolated light showers, but a lot of dry weather too. with the sunshine coming out,

quite strong at this time of year, 18 or 19 could be yours. and i suspect, down on the south coast, bournemouth versus burnley, mid—afternoon, there'll be a lot of sunshine there, a really glorious spring afternoon. however, closer to the low pressure and some of the fixtures, especially on the western side of scotland, they could be pretty wet affairs. if you are coming further south, and it is the challenge cup weekend for the rugby league fans amongst you, castleford versus st helens, i think that one will be essentially a dry fixture. saturday evening on into sunday, if you are out and about you will have to put up with a couple of hours at least of pretty weather as the front moves west to east. it will be away from most eastern coastal areas, say for the north—east of scotland, as you wake up on sunday. another day of sunny spells and showers, some of them sharp, especially in the north—western quarter of scotland, but i hope you have some time on the weekend to enjoy at least some of this dry weather.

and i urge you to do it if you can, because this is what monday looks like — rather wet, rather windy to say the least. hello. i'm tom donkin. welcome to bbc news. here are our top stories: a global cyber attack blocks computers and demands a ransom from governments, companies, individuals and even hospitals. i think it is a heinous crime, this hacking, because they're putting people's lives at risk. a veiled threat to the former fbi boss — the white house won't say whether or not there are tapes of his conversations with president trump. venezuelan pensioners take to the streets to protest against the government — and official figures show a sharp rise in mother and child deaths. and chelsea win the english premier league, at the end of antonio conte's first season in charge.