there's the one. i'm just going to walk towards the cliff. and as soon as you reach, you stop. i need to remember this spot to come back to later. now go to two. three. oh, i'm somewhere else. what's happening now? so basically this time i we kept all the ground information, as you can notice. yeah. but we removed completely all the distant landmarks. . ok, so this is easierfor distance, but harder for direction. exactly. that's great. yeah, you got it. i think it was over here. the tricky bit, trying to get back to cone one. oh, i'm quite close. yeah, well... well, relatively close. maybe i'm not that close at all. i'm in the right field,

i think might be as close as i am. well, i don't know how i did, but it seemed rather challenging and i've done a lot of vr before, so i'm used to walking around in one of these headsets. i wonder how it would be for someone doing it for the first time for this purpose. maybe it'd be thoroughly immersive so it would do the job well, or maybe it would be a bit distracting and make them feel a bit nervous. i don't know. the test doesn't discriminate based on language or culture. navigation is something that we all do. we think that this is therefore a test that works across different cultures, regardless of education, language, demographics. but we haven't tested those diverse populations who historically have always been slightly disenfranchised by standard testing and say, "well, actually, we can do it, we can apply this one and identify in you too." we've seen a turning point in alzheimer's detection recently. researchers have developed a blood test that could uncover the disease long before symptoms emerge. and a new fda—approved drug

may see the progression of the disease slowed down. this means that one day it could become manageable for longer. and although they are in their early stages, it gives us hope that one day the impact of dementia may be lessened. the royal institution is famed for its role in science education. it hosts science shows and workshops, and it creates resources for schools. and thatjob�*s become more important than ever in a world where telling fact from fiction is becoming increasingly difficult. and jacqui wakefield has been investigating how children are being targeted online with fake science. under—18s are the biggest audience on youtube... my favourite youtuber is a gamer called dantdm. i like, like animal videos. mr beast. ..and parents and schools now rely on it as a tool to access

great science content. but there's a new type of content creator, using artificial intelligence to create videos full of false information. imagine being told that the world you live in is not real. creators are tagging these videos as educational content, and they're often beating legitimate science videos in the race to be recommended. these videos do well because they are potentially in some way maybe conspiratorial. you know, we're all fascinated by things that run counter to what we're officially told, and children obviously maybe are more susceptible perhaps to this than adults. we wanted to see if these videos were reaching children. so we created an experiment. we set up four children's accounts on youtube. each account watched 50 science videos from legitimate creators. after only four days, one of the bad science channels cropped up in the recommended videos.

once we clicked these videos, they flooded our recommended feed. but would kids in the real world believe what they were seeing? with the right amount of pressure, the great pyramid could generate. a tremendous amount of electricity. i find it really interesting that pyramids can make electricity. pyramid power plantsl were and are possible. i was quite surprised to find out... ..just a pile of rocks can form electricity. i didn't know that people so long ago would be - able to make electricity- and use modern technology. the person who was talking sounded very professional and knew what he was talking about. we found more than 50 channels creating these bad science videos, and they are getting hundreds of thousands, sometimes millions of views. but how are they multiplying so fast? we found out that these channels are being created using artificial intelligence. a video needs a script, and with al it can be

generated in seconds. then it needs a voice. ai voiceover: it no longer needs to be human. it's not quite there yet, but eventually we won't be able to tell the difference. then ai can find footage from across the internet taken from different sources and piece together the final film. and they're full of false information like this. weather patterns have seen some remarkable changes in the past decades, but these changes might not be caused by climate change at all. here they took old footage from a nasa expert's video. they took out his voice and replaced it with al narration saying climate change isn't caused by humans, which isn't in the original. kyle hill, a science communication specialist, educator and youtuber, began to notice these videos cropping up in his feed a couple of months ago. so being a youtube creator, i always try to have my ear to the ground for what other science and technology related channels are doing.

but it wasn't until one of my viewers actually pointed out that it looked like a lot of the channels they were getting recommended after watching my videos started looking very the same. these channels seem to have identified the exact right thing and how to do that thing to maximise views with the least amount of actual effort. with new ai tools, anyone can create channels in a matter of hours, and there's hundreds of tutorials on youtube. with each video getting tens of thousands of views, these channels can mean massive pay—outs for creators, and creators aren't the only ones profiting. youtube takes nearly half of advertising revenue from every video. youtube told us that they recommend youtube kids for under—13s, which has a higher bar for videos shown. they said they're committed to removing misinformation from their platforms. they also directed us to information panels that show additional context on conspiracy—related content.

we found this was only present for a few of the videos across the 50 channels. they didn't comment on advertising revenue they may receive from these videos. we reached out to some of the channels for comment. one responded saying their videos were intended for entertainment purposes and that they didn't target children. they also said the majority of their scripts were not written using ai. you know, i think the idea that youtube and google making money off the back of adverts being served against pseudoscience, ai—generated news, that's really, that seems really unethical to me. off—screen: that video was actually all fake. i'm actually... ..really confused. i thought that was 100% real. i would've probably believed it i if you hadn't told us it was fake. i think i did believe it until a few minutes ago. i'm just shocked. i think this is an emerging threat. i think that we don't have a really clear understanding yet of how ai land ai—generated content is reallyl

impacting children's understanding. good information is probably going to be pushed out. we will have so much ai—generated content that you will not want to spend the time or the effort ever sifting through it. but some of the kids were able to spot that there was something not quite right about the videos. maybe because of the, like, voice, like the choice of... voice they had. yeah, they used, like, an ai voice. i thought was fake because, like, you could tell, like, _ that it was not edited properly. ai is evolving fast. as these videos continue to multiply, bad science could drown out good content. and that's all we've got time for. thank you for watching. see you soon.

hello there. let's take a look at the weather for the week ahead. now, it was another day of contrast again on friday with a band of heavy rain across the central belt of scotland, also the eastern areas of northern ireland. towards the north of that band of rain, some brightness towards the south, a lot of sunshine, such as here in bedfordshire. now towards the south, it is going to feel quite humid this weekend. fresher conditions further north and some rain wherever you are, courtesy on sunday of this deep area of low pressure that's going to be pushing its way further northwards and eastwards and that's going to help to spark off some heavy thundery downpours. on saturday, a bit of wet weather around as well,

possibly a rumble or two of thunder in some of these showers towards the south—west of england. our band of rain further north is gradually fragmenting. it's weakening, but still some showers, i think for the north—west of england, some brightness across scotland. best of the sunshine again towards the south—east of england and east anglia with that south—easterly wind just drawing in the humid air from the near continent. in the best of the brightness and sunshine, temperatures could get as high as 26 or even 27 degrees celsius on saturday night. as high as 26 or even 27 degrees celsius. on saturday night, again, range of temperatures out there. it's going to feel really quite cool. i think towards the north of scotland, lows here of around three degrees celsius underneath clear skies. but towards the south—east of england, again, in that humid feeling, air temperatures may not drop much below 16 or 17 degrees. so an uncomfortable night of sleep here and it stays humid in the south on sunday. the humidity, that deep area of low pressure will help to spark off the heavy thundery downpours that will gradually push further northwards and eastwards throughout the day. mostly dry in eastern scotland. the wind turning more south—easterly as we head throughout the day. again, a range of temperatures. we're hanging onto that humid feeling here.

watch out for some frequent lightning strikes perhaps towards the south as we head through sunday night and into monday. but we're all going to be seeing fresher feeling conditions into next week. it's a very active week weather—wise with cold fronts pushing eastwards throughout the day on monday. behind the cold fronts, of course, fresh feeling conditions, but some sunshine ahead of that main rain band and some sunshine behind it as well. but also a rash of showers. so plenty of wet weather around on monday. we'll stay in that humid feeling air until we get to the afternoon towards the south, and the east, 21 or 22 degrees celsius. still fresh, a feeling, conditions digging in behind. and there's plenty of activity out in the atlantic as we head through the rest of the week. some of these systems tied up with the remnants of hurricane lee. let's take a look at tuesday. so at the moment, we think it's probably going to be quite a showery day. the winds will be strengthening as this second deep area of low pressure starts to approach. temperatures will be a lot closer to the seasonal average,

really the mid to the high teens. they're already feeling cooler by the time we get to tuesday. but curiously, on wednesday it could turn milder again, particularly in the south. that's because we've got that tropical feeling air coming through. deep area of low pressure out towards northern ireland, western scotland, some strong, gusty winds here and plenty of showers. these will be the days highs on wednesday, fresher again towards the north, but warmer in the south. and more showers expected on thursday and some very strong, gusty winds. the details of all of this are likely to change as we head through the week. but what we do know is that we'll see a return to those fresher feeling conditions and it will be very, very windy at times, particularly out towards the north and the west. so a very active week. westerly winds, fresher feeling air. here's the outlook for our capital cities as we head through the week do keep an eye on the forecast.

live from washington. this is bbc news. bbc teams witness the devastation left by libya's catastrophic floods — as survivors and crews battle the elements in derna. workers at the three top us carmakers walk off the job — in the first—ever coordinated strike of its kind. a possible end may be in sight for the years—long war

between saudi arabia and yemen's houthi rebels. good to have you with us. we begin in eastern libya, where crews are working around the clock to search for thousands of missing people — in the aftermath of catastrophic floods. it's now five days since the disaster that hit derna — which lies to the east of benghazi and the libyan capital tripoli — and there is still little evidence of much international assistance. our correspondent anna foster has seen the extent of the devastation — and reports on the lack of basic supplies and the likelihood of disease spreading. the first thing that you will notice is how incredibly dark it is. there is no electricity in this city and, actually, the workers, you can see some

of them over there, who are using big diggers to search for bodies,