this is bbc world news. the headlines: 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 three hundred dollar 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". thousands of elderly venezuelans have taken to the streets of the capital, caracas, and other cities to protest against the government of nicolas maduro and show their discontentment with the worsening economic crisis. police blocked access to a main road in caracas and used pepper gas to try to control the crowd. in around ten minutes it's time for newswatch,

before that though time for click. 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 formally —— 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 the environment.

countries have met and agreed to reduce carbon emissions and invest in clean 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 release 10 million times more energy than fossil fuels, with an almost limitless supply which could keep the planet running for millions of years? well, turns out, there is, and the 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, they fuse together forming helium, and releasing immense amounts of energy. this is nuclearfusion and this is what scientists have been trying for more than 60 years to recreate down here on earth.

we have to do something similar to a star, which has gravity, and to do that we use magnetic fields. and we're talking about magnetic fields that create more pressure than the water pressure at the bottom of the deepest ocean. so you've got this huge pressure trying to compress the plasma, and you've got to hold it in place for a very long time as well, to get more energy out than you put in. if you can keep the 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, that's when the magic happens. that's also the hard bit. we are making progress, though, we have already achieved fusion, and some of the best fusion happens inside machines called tokamaks. what is a tokamak?

this is a tokamak. now this one is just outside oxford, which turns out to be a bit of an epicentre for fusion technology. the world's largest tokamak is just 15 minutes up that way. there is a problem with these machines, and that is that you end up having to put much more energy into these things than you ever get out through fusion. which is obviously not ideal. but the company here is taking a different route. this is the lab of tokamak energy, which is developing relatively small tokamaks. smaller prototypes can be tested and improved much quicker and more cheaply, as the science is understood and the designs refined. this approach means the team may be the first to work out how to produce a net gain of energy. go on then, fire it up. 0h! my word!

that is a fusion reaction! inside here, we are generating plasma, which is gas with electricity flowing through it and we're going to fuse atoms together, join them together, to generate fusion energy. and this light show isn't even fusion. this isjust a warm up which is hoped will happen in the next year. and then what we're going to do is heated up to over 10 million degrees, up towards 100 million degrees... what will that look like? we won't be able to keep our face this close because it would get damaged. we will have to be further away outside some sort of concrete barrier. but it will actually start to go transparent, as the plasma gets really hot, ten times the temperature of the sun, 100 times the temperature of the sun. once they have achieved the temperatures, they need to keep the plasma in place long enough for it to become self—sustaining and this is what the team hopes

will create magnetic fields strong enough to do that. instead of thick copper cables, a strip of super—thin superconductor made of yttrium barium copper oxide. all this sounds hopeful, but the joke is that nuclear fusion has always been 30 years away. if successful, it will mean the end of our reliance on fossil fuels, but there's still a lot of science to do between now 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. it is one of the biggest fund—raising events of the year.

nearly 40,000 people ran this year's london marathon and wealth funds are still being counted, organisers are hopeful they will smash last year's record of £59 million raised. 0nline fundraising platforms now play a big role in attracting more donations, pushing the charities‘ causes across to users whilst also enabling them to give money with just one click. justgiving, one of the biggest players, raised just under £350 million last year. this is a figure that charities may not have been able to raise without these sites, but these donations are also big business. justgiving takes up to 5% commission, whilst 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's not going towards their causes. so the majority of our funding comes from individualfundraisers. for example, one of our runners is currently on £1500,

and 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 a top to toe checkup, hiv testing and tb testing and be insured their health and well—being. 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 problem with 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 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 maybe to work the system a bit, because it's all about making money, making money now not for businesses but for good causes. it's 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 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 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. in school, i wasn't the good kid, if you understand. so how does it cover its costs? well, instead of taking commission from donors, it plans to take the money from businesses. they have developed this platform for companies to build a profile for themselves showcasing the good causes they support while building the brand name. the companies will be charged a monthly fee. i think it is quite fitting that kindlink 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 that up and come over here and work for charities. that and a small canoe! hello, and welcome to the week in tech. it was the week that microsoft released an urgent software update after discovering a flaw in the windows operating system. the bug could give hackers access, by simply sending an e—mail, which didn't even need to be opened. a 16—year—old's tweet about chicken nuggets became the most retweeted ever. aus a us plane arrived after being top secret. having landed at the kennedy space centre, all that the pentagon declared about the air force's robotic mini space shuttle is 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 smartsuit pro with camera free motion tracking system costs a fraction of the pro kit, but at $2,500 it could prove game changing for independent movie—makers and game designers. that's it for the short version of click this week. the full version is up click this week. the full version is up on iplayer for you click this week. the full version is up on iplayerfor you to click this week. the full version is up on iplayer for you to watch right 110w. up on iplayer for you to watch right now. next week will be rather epic, so now. next week will be rather epic, so find time for that. follow us on twitter and facebook corrupt the week if you would be so kind. thanks for watching and see you soon! hello and welcome to newswatch with me, samira ahmed. she won't take part in a televised leaders debate. if she won't, then he won't. could the bbc have done more to make a head—to—head happen? and are the green party being given a fair share of airtime on the bbc‘s special

election programmes. there has been a bit of a phoney war feel to the election campaign so far. before the parties began publishing their manifestos. many questions had been fobbed off with this answer, given to laura kuenssberg byjeremy corbyn on tuesday. well, you will have to wait for the manifesto for the details. you were expecting that answer. those manifestos will be officially unveiled next week, but on wednesday night we got a sneak preview of what labour's might contain. somehow, an earlier version had ended up in the hands of chris mason. i can't claim i've read it all, but here it is. stamped right through the middle of the document, about 20,000 words total, "draft: confidential" — in other words, they hadn't quite anticipated me waving it around on the telly. but i can do, because we've received this leaked draft. well, he could leave it around on the telly, but should he have done? tim grant was among several newswatch viewers who thought not, asking, if it's got

confidential written on it, is it right to pasted all over the news? and david gregory elaborated on that. "one report explained how the word draft was on every page and that this report was not meant for public viewing." why, then, do the bbc take the opportunity to make a moral stand here and not report on what was in the manifesto? this is, in effect, a stolen document, and therefore should have not been used in the way that it was. we didn't discover much about the conservative pa rty‘s policy plans on tuesday night's 0ne show, but we did get a few insights into the personalities and marriage of mr and mrs may. i get to decide when i take the bins out. not if i take the bins out. there's boyjobs and girljobs, you see. eurovision. now, we're not leaving that as well, are we? no. i'm tempted to say in current circumstances i'm not sure how many votes we'll get.