this is bbc news. we'll have the headlines for you at the top of the hour, which is straight after this programme.

this week — we're revisiting some of our favourite tech stories that we've covered from around the globe, starting in australia, where nick meets the people though some of the techniques are a bit old school. it looks like a giant thermos flask. yeah... we brave the permafrost on an island off norway it's a remote destination, far away from wars, crisis, terrorism, disasters. two—wheelers on the country's roads. fuel tank. and in switzerland, there's something weird lurking in the water. hey, those are my toes you're talking about.

as a carbon sink, removing c02 from the atmosphere. at its core is coral. leading to recent mass bleaching events, turning them ghostly white and sometimes dying. efforts are under way to help. one idea being developed

here is to preserve coral biological clock. so these cells are frozen in liquid nitrogen, and the temperature of the liquid nitrogen is —196 celsius. wow! right, 0k. well, let's get the lid back on, then, and keep them safe.

but using computer—assisted analysis, researchers are able and there's a bit of, um, artificial intelligence in there, that machine—learning approach for predicting, for example, which colonies we should be biobanking from. equates to more than four trillion sperm. a lot of sperm in those vials. getting them here requires careful transportation. so this is a mini tank. and this will hold the samples in place wow.

so where those samples came from. put inside that canister. set for travel. let's put it back. we're seeing corals not being able to withstand these activities for those particular reefs. their eggs to be fertilised, only happens once per year. we can only cryopreserve sperm and use that sperm during spawning.

them out on the reef at any time of the year. are being developed to help raise coral babies. and measure their health, - so that we know that the corals ready to go back onto i the great barrier reef. traditionally, all of— the counting is done manually, while it takes an expert about an hour to countl a couple of seconds! as fast as a human. even so, they've got

their work cut out for them. of these coral tiles - being measured and counted as well as cash, it could save lab time by generating heat maps. that the corals are doing well. help save the reef? can have maximum effectiveness. adrienne: what happens if our most valuable data is lost, or if, years from now, the technology it's stored

on becomes obsolete? it closed down three decades ago, and now it's home to the arctic world archive. it's certainly an unlikely location. terrorism, disasters. it's a demilitarised zone. so what could be safer? superpowers in the world.

into the darkness. let's do that. we're going 300m deep into the permafrost, where temperatures are sub—zero. and behind these doors is the vault. it's inside this container where all these precious artefacts are being stored, safeguarding a snapshot of our culture, history and technology for future generations. it's all put on reels of film, kept in these silver packets. now we have more than 100 deposits from 30—plus countries across the world. so it's a wide selection of cultural heritage, filled with treasures.

this is a very special container. the future of software. it's become so critical to our day—to—day lives. we're essentially building another wonder of the world and also how you'll actually be able to read them. it's dark, dry, and very chilly down here —

conditions which its owners claim are ideal for storage that could last centuries. how does that help preserve it? nobody can guarantee what will survive. so this is a place to make sure that information survives technology, obsolescence, time, and ageing. it all sounds rather dystopian. and 1,000 years from now, will people understand what's here? so that means, on the film itself, stored in this vault, you have all the instructions future generations will need

the archive�*s owners also run the data preservation company piql, and back at its norwegian offices all those files are printed onto film. data is a sequence of bits and bytes. from our clients' data into images. we are sending those raw images onto film. after that, we develop the film, we can scan it back and we can decode the data just the same way a user

their films inside the vault. one by one, reels are added. for many here, it's a significant moment. of chopin's music, archives ofjaguar car models of islands that could disappear as sea levels rise. the highest point of the island is three metres, and they're l i take deposited records all the time. it's really surreal. i'd never thought i'd be taken

as an archivist, i'd be but people are making plans to preserve the data we have today, no matter how uncertain the future. the owner of instagram, facebook, and whatsapps says emerging technologies can be accessible across the world. and take years to complete.

history — but experts agree it will almost certainly take—off by a car. it's known as model a, and has received flight administration. to fly over a trafficjam comes with a hefty price tag of $300,000. electric, with lightweight bikes and hot swappable batteries making a lot of sense. but even the e—scooter�*s taking

a while to reach everyone. nikhil: 250 million. emitting harmful pollutants that are adding to the worsening air quality of its cities. but one company now claims it has a solution. this is bajaj auto's freedom, the world's first motorbike that runs on compressed natural gas, or cng. in a cylinder, and is both cleaner and cheaper

now, cars, trucks and even tuk—tuks have used cng for long. years of trial and error. so what have been the big challenges in designing this bike? the motorcycle has very little space. of a certain shape. so that has to be integrated and designed as to take care of that. which weighs 15 kilos, which has been packed into this bike. so you can see how large this is. along with this, to give the customer reassurance two—litre.

bajaj claims using this fuel effectively halves the running cost of the motorbike and dramatically reduces like riding any other bike. the big question on everybody�*s minds is really the timing when we are all on the cusp of that big ev revolution. the indian government wants 80% of all two—wheelers on its roads to be electric by 2030. is that a problem? today is impossible. i caught up with shumi, who reviews bikes for a living. a threat to these cng bikes in the next few years? i think we are too large a country for things to pose a threat to each other

automatically — 0k? this bike is going to end some other bike — and honestly, nothing has ended ever. transitioning a country this large all the way to electric at 80%, where is the capacity in terms of power, in terms of battery manufacturing, in terms of cells, in terms of actual manufacturing? who's going to sell them? where is the infrastructure? it's a cascade of things that has to fall into place first. we are moving in that direction, but i can very to meet that goal.

ah! 0h! 0k, whose stupid idea was it to film parts of this report oh, god! twice. now, the person making a whole lot less fuss than me here isjulia bislin, one of the team representing so, search and rescue, and then also ammunition so, we mainly started for the swiss police departments and the swiss military.

around it is rushing past at three knots. tethys 0ne is the newest version of this drone. it's pretty nippy. uses to build up what's called a 3d—point cloud of the area. how are they looking — blue? actually, are they still there? i can't feel �*em.

oh, god, ah! ..and for me to avoid hypothermia. take me on an adventure. sure. show me the sights. as is common in robotics these days, andrej is using tested, and reliable games controller to steer the drone. nothing too crazy. it goes pretty fast. yeah, definitely. years of my life nearly professionally. i can't keep up with this. you can believe that, can't you? you can believe he was a nearly professional swimmer. well... honestly. but it can also operate without the cable, driving autonomously and avoiding obstacles and mapping

its own area — which is no mean feat, given that, unlike airborne drones, it can't see gps satellites so, when the drone sees like new fields that it - all the information together. it's more or less the samei thing, butjust underwater. 0k. yeah. using sonar as well as normal cameras, plus the option to fit to target industries operating in tricky environments. turbines, oil and gas pipelines, communication cables, and maybe even the hulls of ships — all areas that are

hazardous even to the most a lot of fish, yeah, exactly. wow! tethys is another example of what happens when students meet and study at university — in this case, eth, in zurich — further. there's a chair! a chair, yeah. i mean, it's for sure cosy. i'll tell you what, i often see the occasional wild and that's it from us from zurich, which is looking incredibly beautiful today, isn't it?

hello there. we ended the week with a band of rain pushing eastwards across the uk, but ahead of it, with some sunshine and a brisk southerly wind, we saw the temperature in lincolnshire that's made it the warmest day of the year so far and the warmest day since 2a november. few showers as well. in from the atlantic. and the cooler weather is going to be coming keeping temperatures a bit higher here.

elsewhere, temperatures could be as low as 5—6 celsius come the morning. the rain does move away from east anglia and grazing northern ireland, pushing into the 1—2 showers for england and wales as well, but many now, it's not going to be as warm as it was on friday, it'll be a quiet end to the day, but it gets noisy that's going to bring with it that band of rain. it's going to bring with it some stronger winds as well. the winds strengthening through the day, particularly widely, gusts 50—60mph, stronger than that around irish sea coasts and over the highlands and islands. and we've got this rain pushing slowly eastwards as well. and over the moors of the south—west.

and those temperatures still a reasonable 11—12 the high temperatures that we had on friday. overnight and into monday. the low pressure moves through and the winds tend to drop as well. temperatures are going to be a little bit lower, close to normal, and for the most part, it's a mixture of sunshine and some showers.

live from washington, this is bbc news. donald trump says his french and british counterparts have

to the israeli authorities, which hamas said was that appears in court in new york. hello, i'm lucy hockings. the rhetoric from the white house over ukraine reached a new pitch tonight, with president trump criticising the leaders of the uk and france, for talks with him. the us president also said he was "sick" of president zelensky and didn't believe ukraine's leader needed