at wembley this season. look, i played one cup final. in roma stadium, against roma, and i won. and i played a cup final in my stadium and they lost. so i think when you go to these big moments, with these big decisions, semifinals, finals, i don't think it is an advantage. tomorrow, chelsea ta ke is an advantage. tomorrow, chelsea take on southampton in the second semifinal. britain's fa cup tie with japan is poised once —— at one apiece. additional onejohanna poised once —— at one apiece. additional one johanna konta got back into the tie but had to work ha rd to back into the tie but had to work hard to beat her opponent, 6—4, 6—2. 1-1 hard to beat her opponent, 6—4, 6—2. 1—1 after heather watson lost. you can 1—1 after heather watson lost. you ca n follow 1—1 after heather watson lost. you can follow all the action on the bbc

sport website. i think throughout the whole match, she did an incrediblejob of raising to the occasion and she used the energy of the crowd as the crowd have been great. and i think she did a really good job of using that and she made it very hard for me. i knew straightaway but was not going to be an easy match and i was going to have to earn my way to get an opportunity to come through as the winner today. mark selby made a terrible start to the defence of his world snooker title in sheffield. he is looking for a fourth title in five years, playing jo perry, and lost the first four frames of his opening round match. perry had to play three qualifiers to make the main draw, selby did take the first two frames after the break, he is trailing 4—2 currently. this is the live action from table one, selby, not at the table currently. after pulling those two frames back in the second half of the session. perry is at the table, reading now. 41—14 in that frame. you can follow it all on bbc

two. the other first—round match two. the otherfirst—round match is hong kong's marko through against chan, the chinese qualifier making a great start against fu who has more experience in this tournament, but going well. fu at the table is leading in this break. that is all the sport for now. now, it is time for click. this week, near miss... bullseye! and, a lifesaver. with spencer away this week, i've been left drone alone.

we are in andalucia, spain, where some important testing is going on which could be crucial to the way the global economy moves in the 21st century. why? well, last month, chinajoined an exclusive lineup of countries allowing drone deliveries. after its government gave the official go—ahead. the us is expected to follow suit within weeks. yes, after years of talk about everything from duvets to dog food making its way directly to you through the skies, it's starting to happen — whether you like it or not. this is just one drone, that could be making one delivery. but in the not—too—distant future, our airspace could become a much busier place. the biggest internet shopping companies in the world have been talking about drone deliveries for some time, and here they are trying to find a way

of making this possible safely. more on that in a moment. but first, dan simmons has been to california to meet the people behind what is expected to be the us‘s first commercial drone delivery service. blink, and you'll miss it. travelling at 80 miles an hour, with a range of 100 miles, the new zip drones are fast, and they stop even more suddenly. the on—boa rd navigation equipment brings the aircraft to within a metre of the landing rig, tripping the sensors which jolt the zipwire upwards to catch its tail hook, plucking it out of the sky. delivery is pretty sharpish too — when the gps module confirms the aircraft is in position, a catch is released and the goods fall to earth. if you have not seen a zip drone before, you may be thinking,

i should have ordered the calzone, because any other pizza would need some fresh toppings after a landing like that. but the well—protected fresh cargo here is blood, or plasma. that could save someone's life. when someone is having a medical emergency and needs a product, speed is basically everything. and our goal is to be able to provide access to a wide range of medical products so fast that the patient doesn't actually even know it wasn't stocked at the hospital to begin with. the company says doctors in rural hospitals in the us would be able to send an order by text. the blood run would begin within two minutes, and if you think that's a stretch, zipline's already doing it here in rwanda, and soon in tanzania. this is nest i, the site we first visited just outside kigali in 2016. while this base and its drones are monitored from california, on the ground, it's now

exclusively run by rwandans. and the 18—month track record is impressive. zipline's team in rwanda has delivered over 7,000 units of blood, flying over 300,000 fully autonomous commercial kilometres. and then of those, about 1,100 are emergency deliveries, so a delivery where a patient is really relying with their life on receiving that product quickly. the team has been able to have a very big impact on the healthcare of a large number of people. what is happening now is that it is possible for states and cities to independently ask for permission to fly, and present their own safety cases for how that can be done in a way that is safe for people on the ground. 0verlooking california's pacific coastline lies half moon bay, zipline's original home, and where it still carries out research and built this year's new model. and this is what they have come up with.

it's faster and more efficient than the previous version, for a number of different design reasons. one of them has been designed by paul here, and this is the airframe — look how light that is, how heavy is this? it's1.09 kg. and what are the other advantages of something like this? we designed this airframe to be very modular, so this is the skeleton, we can ship this around the world and all the other pieces bolt on interchangeably. something else that is different with this design is they've moved the engine to just above the fuselage. so before, they had two engines under each wing, and you might expect to have an aircraft to have an engine at the front as well. this is pretty unusual, brendan is responsible for this part, why on top? so, one of the disadvantages of the previous design is that if we lost a motor, we would have asymmetric thrust, so the tail would have to fight it and the plane would often become unstable. in addition to that, we're fully redundant

as far as power goes. so if you lose a motor, a single motor can fly the plane. and i hear being on top of the aircraft, it's a lot less noisy? yeah, the fuselage would absorb some of the sound there. and, sven, you designed the tail, why is it a v shape? it gets it out of the prop wash, which is right down the centre of the tail boom. it lets the surface be outside of that area of airflow. and also, because of our unique lining situation, where a line trails the bottom of the tailbone and catches on the hook at the end, and if you had a traditional horizontal and vertical stabiliser, the horizontal part of the tail could get hooked onto the line. all of those changes mean that this aircraft is, they claim, the fastest of its type for drone delivery, and it will go further than any other aircraft. and that is largely because those designs allow for this huge, nine—kilogram battery to be put in the front of it — twice as big as the previous version —

and that slots into here. the new model is a lot quieter than the previous one. in fact, in this rural environment, i can actually hear the birds singing to each other more loudly than the drone. and that would no doubt come as great comfort to anyone who is worried about the din of buzzing in the sky when drones start delivering for real. safety will be the highest priority. the zips operate between 110—100 metres up and away from airports, so passenger planes won't be a problem. but what about the risk of drone—on—drone crashes? whenever any plane is able to detect any other plane anywhere in its vicinity, both of those planes will actually change their altitude in order to ensure that they are not on the same vertical plane as any other vehicle. to make sure they don't crash?

that's right. that's governed by zipline's own air—traffic control system, but what about other people's drones, not on their radar? the vehicle will have a sense—and—avoid system will allow it to detect any other vehicles, anything that is not in the zipline ecosystem, and make, if necessary, evasive manoeuvres. there are radar systems, lidar—based systems, there are also ones that use microphones to detect other vehicles. you said you're looking into that area, does the aircraft currently have... no, there is no current sense—and—avoid system. at the moment, zipline reports in to us and rwandan air—traffic control, systems that are unlikely to be able to cope when more drones take to the sky. so far, though, they've had no crashes.

and should one lose positioning, or comms, it flies straight back to base. in the coming weeks, maybe days, the us authorities are expected to hand out their first commercial drone delivery licenses. how many operators will follow will largely depend on safety, need, and perhaps whether we prefer convenience over the buzz. that was dan, in california, and hejoins me here. as does a drone, which is rather noisy. loud buzzing it is, they really are. if we just show you how important it is where the engine is placed. at the moment, they tend to be out and unprotected, which makes it noisy down below. as members of the public, whether we will put up with that remains to be seen. but there are things you can do to reduce that level of noise. that is one issue — another is that it seemed in your report, we are still reliant on traditional air—traffic control,

the same as planes. zipline said they keep their own planes separate from each other with their own systems, but there is nothing to stop a zipline plane hitting an amazon plane, because they are on two separate systems. apart from those sensors that are onboard each aircraft, but if they fail, there is no overriding systems that will keep those two planes apart, and that is still a problem in the states. so a pretty substantial issue that needs to be overcome, thank you very much. and that is exactly what vodafone are trying to deal with here. at this testing facility, they're experimenting with using the mobile network to create a low—altitude air traffic control system for drones. each would be fitted with a sim card, making it possible to autonomously control and track them. this could work across a region, or a country, and would hopefully mean many safe flights free from collisions or disappearances. this is the prototype they have been using today, inside, you have gps, a gyroscope, a camera under here, but also, if we take this off, you can see there is a mobile phone. we're not quite at the stage where

it's running with a sim inside, and clearly, there is a way to go, but at least this is a decent way to test it. the on—board camera would still help it avoid bumping into unexpected obstacles — like a bird or, indeed, fellow drones. while this one can only carry a load of up to three kilograms for 15 minutes, or go longer with less weight, there are of course drones that can do more, and battery life will improve. the plan here is to employ both gps and the mobile network, although that network can currently only locate to within 50 metres, it should serve as some protection from gps hacking or spoofing. on top of that, artificial intelligence will be at play, aiming for better accuracy and to help keep vehicles out of geo—fenced no—fly zones. but if we're looking at deliveries like this becoming the norm, there's likely to be a lot of them in the sky at once.

for the future, with multiple — maybe hundreds, maybe thousands of devices — flying over an urban area, we would no doubt need more advanced networks, and that is why we are preparing sg, and bringing some of the sg techniques onto ag. but what happens when they drop signal? they don't fall. he laughs if you imagine on your flight path, you are just passing through an area in which maybe temporarily there is no coverage or there is interference, you can be preprogrammed to continue with your flight path and just keep doing what you are doing, and to maybe recover the signal, or you return home. initially, theyjust fly through designated flight paths,

in the same way planes do, just a lower level. they are currently being tested at about 120 metres. but as the technology evolves, it is hoped they will be able to pick up or drop off your doorstep. but do people actually want all these drones flying overhead? we've been through that process before with aeroplanes and even with cars. and i think starting off with defining routes is a very good idea, which generates much more benefit with the least disruption. what you will probably find is that these things are used as a trunk route to start with, and then they will be used in specific areas. to fly to places like hospitals, where they have a zone on the roof of the building you can use. we're still a little bit away from everyone having a drone park in a garden. although you could find that your home is under one of those drone trunk routes. vodafone may be the ones testing this, but it's not just about one provider. all our work has been made public, and is available for everyone to use,

and we expect other networks will implement it in the same way we have. so we are not making money out of royalties or patents or licensing. the technology hopes to be ready next year, which is also when the european commission says it wants safe, commercial drone services to be available. but above and beyond all the excitement or dismay, the idea may muster up, nothing can happen until the regulations are enforced. hello and welcome to the week in tech. it was the week that google chrome blocked videos from auto—playing with sound. bitcoin's price volatility inspired a video game. and tesla again temporarily suspended production of its model 3 cars. it was also the week that ethics were put at the heart of future artificial intelligence developments by a uk parliament report. "ai should never be given the power to hurt, destroy or deceive", it said. in europe, authorities want to force tech companies to hand over communications of terror suspects

within hours of a court order, even if the data is held outside itsjurisdiction. and facebook‘s woes continue — a us court ruled the social media giant should face a class—action lawsuit. it's for allegedly identifying users with facial recognition software without their explicit consent. facebook started rolling out the feature to its european and canadian users this week, but at least asked for permission first. and finally, you want tojoin him for a pint? i must warn you, he's not the best drinking buddy, as he can't reallyjoin in. fred is the creation of engineered arts, whose workshop click visited a few weeks ago. the bot is busy promoting the upcoming season of the science fiction tv series westworld. he features a skin—like material and hair on a mechanical body. creepy! ‘with vesuvius brooding in the background, excavations

are going on at pompeii as well. archaeologists and historians have already been thrilled by many exhumed wonders of the past.‘ archaeology might make you think of pickaxes, paintbrushes, and needing a whole lot of patience. but the tools of archaeology are changing. the question is, can one of these ever be replaced by one of these? this is google's 0pen heritage project. released this week, the project throws open a tomb of high—res 3—d scans of centuries—old buildings and monuments. all the scans are free for anyone to reuse, as long as what you create is not commercial. the full online collection spans 18 countries and includes sites like chichen itza in mexico, ancient corinth and here, the thousand—year—old temples of bagan in myanmar. google are hoping that by making this sort of data available, all sorts of people will find interesting things to do with it. a bit like this, perhaps. this is a virtual—reality

experience, made with one bit of the data. female voiceover: in the eim ya kyuang temple, we find five buddhas with their hands in gestures. the experience takes you on an immersive tour of two of bagan's temples. all over the walls are these incredible paintings and they're showing the previous lives of buddha. and you can get so close, you can really see the details. as well as learning about the history of the site, you see some of the damage that was done during a major earthquake in 2016. but what's great about having this sort of data is that preservationists can use it to restore the temple to this exact state with millimetre precision. scans of this — and other sites around the world — could form an invaluable tool to preserve places even if they are damaged or destroyed. while google may be shouting about this project, its scanning company cyark has done the legwork on the ground to gather all this data. much of it's been captured using lidar — that's a technique of firing lasers to record how far away things are.

do it millions of times and you get something like this. combine that with thousands of photographs and you can get some pretty detailed data. we are genuinely excited to find out and see how this data is going to be used by the education community and the heritage preservation community globally, how students will use it, teachers may use it. cyark has over 100 sites in its full library, so we could see even more data come online soon. for now, though, the 28 that are available will have to do. i, for one, can't wait to see what people make of it. back to drones. only a couple of months ago, we showed you how firefighting crews could be using them to gain safer access to buildings in emergencies. but on the east coast of australia, it's a very different issue that's being dealt with. in a place where shark attacks are all too real a problem, they are playing lifeguard. we sent nick kwek to find out more.

the sandy shores of eastern australia — a haven for sunshine, surfers, and occasionally... sharks. last year, there were 15 unprovoked attacks on australian coasts. and just this week, two surfers were bitten by the fearsome predator. patrolling the gold coast since last summer, westpac little ripper drones have been surveilling for sharks and alerting lifeguards and swimmers. they work with a custom piece of artificial intelligence software called the sharkspotter, which is scarily effective. we have more than 90% accuracy with sharks. a trained human operator flying on a helicopter has accuracy around 20—30%. 90% accuracy! the programme uses object recognition to identify and decipher between people and marine life, and it gets smarter as it goes. we have to draw boxes around each

of the objects and say what kind of, or what type of object is that. it has to be done, it's a manual process. how long does that take? well, it takes a long time. we have to edit manually more than 20,000 frames and use it for training and testing. once a shark is detected, the drone hovers near swimmers and warns them via an on—board loudspeaker that it's nearby. klaxon wails huge swells in the waves means that sending outjet skis or human divers is really too dangerous, and pretty much pointless. but having an eye in the sky can really help. when you have the bird's eye view, you can easily identify and tell the difference between sharks, dolphins, manta rays, turtles, but also, it's been really good for search

but also, it's been really good for search and rescues, where a drone can find a patient — especially in high seas, high swell — it can tell you exactly where the patient is and probably the best way to get them back to shore as well. earlier this year, the world's first drone rescue was successfully completed by one of their fleet. took off, flew down the beach about 800 metres, found the kids, deployed the pod to them. they grabbed it straight away. took about 70 seconds from take—off till they had the pod in their hands. and then that helped wash them in — they couldn't swim in on their own, they were in a bit of trouble. they were pretty lucky we were there that day. to pull off this feat, the drones are equipped with a neat little package. so underneath here, there is a little mechanical arm which is carrying this payload, and when it's time to be deployed, a switch is flicked, this drops down and upon impact with the water, it rapidly inflates. it's enough to carry four people for 2h hours. as well as improving response time, the ripper group claims its system can reduce cost.

instead of having several lifeguards, you could have one drone, for instance. but the idea is not to replace human lifeguards. no, it's like another bit of equipment for us. for example, our jet skis, you know, people were a bit worried about jet skis, then maybe we might have to less lifeguards because we have a jet ski now, but you learn to use them in the correct way and the correct conditions. so in no way it's going to replace people, in no way is it going to replace helicopter rescues. it's just another bit of equipment we can use to save someone's life, potentially. it's not all rosy, though — these are aircraft working near water and people. recently, one of their drones malfunctioned and had to do a crash—landing in byron bay. they patrol hourly for less than 30 minutes, so they're only watching half the time. and, of course, there's the weather — high winds or rain means no flying for little ripper.

0ther waterborne solutions exist, such as the static clever buoy by smart marine systems. it uses sonar to detect distinctive shark movements and sends a text message to guards to raise the alarm. it comes with underwater stereo cameras, too, which verify the findings. the kit is being used in a $60 million government project to mitigate shark attacks. but will these high—tech solutions ever really take off? the price is a big factor that will change significantly, and we've seen that in the last three years. 0urfirst iteration of the westpac little ripper life saver was $160,000. we're now down to $15,000. there's only 400 beaches around australia that are actually patrolled by lifeguards. so, and there's 2,000 beaches around the australian coastline. so we want to be able to patrol that other 1,600 beaches. dr sharma is now cooking up a system to spot crocodiles, which thrive in muddied waters, making them harder to see. and he's training the kit to identify signs of swimmer distress, meaning lifeguards could get to the scene before there's a chance of drowning.

right now, at least, it can help us swim... with a little less worry. nick kwek there, working as hard as ever. that's it for our drone special. spencer will be back next week. in the meantime, you can find us on facebook and twitter. but from spain, it's adios. thank you for watching. hello, once again. thank you very much forjoining me. welcome along to our latest thoughts on how the weekend will pan out. still a lot of fine,

warm weather to be had through the rest of the day. we have got the high pressure dominant, which has brought us this extraordinary spell of weather. there is no disguising that we have this weather front not far away. there are other changes possible as well. we have already seen the threat of a shower through these clouds into the west country. the first part of the day, and certainly by mid—afternoon, that threat could extend to parts of wales, midlands. they're well spaced, you could miss them all together. a little bit more cloud perhaps, tempering the feel of the afternoon. highs of 2a, possibly 25. through the evening and overnight, we will have that threat of showers or thunderstorms. joined later on towards the east, perhaps, and all the while on a warm

night, we have that weather front just beginning to assert itself through northern ireland and the western fringes of scotland. sunday, the great day for the london marathon. that'll be conducted ahead of that weather front. think heat, you really won't go far wrong. hazy sunshine, too. so take all the necessary precautions. that weather front will make a huge difference to the general feel of the day. ahead of it may be a late shower. the remnants of the front eventually getting down, but it will still be warm in that south—eastern quarter. but look at the contrast in the temperatures. we'll lose several degrees on what you have experienced in recent days. here we are on monday, this looks a bit more like april. and another set of weather fronts coming in from the atlantic. more cloud, more breeze, and the chance of some moderate bursts of rain. the odd shower running ahead

of that, and no more than 28. we're closer, at best, to around about 18 degrees. take care. good afternoon. north korea's leader says he is suspending nuclear missile tests and shutting down a key test site. kim jong—un made the announcement ahead of a summit due to take place over the coming months with the united states and south korea.