oh, ready knows. welcome to tech told me about hackers and paralyzing between your societies. computers that out you and governments that go crazy for your data. we explain how these technologies work, how they can go in for, and that's how they can also go terribly. what you know, new to more than half of old people worldwide live in cities and it's getting hotter that would counting green building facades help to keep our cities cool. ornamental fish in the living room may look nice, but what are the environmental consequences? many people are increasingly exposed to heavy rain and flooding. scientists are now

asking why the floods or so destructive with more about all this now on tomorrow to day d. w. science magazine. an average of 125000000 people worldwide full victim to flood disasters every year and more than 90 percent of them live in asia. research to say it's there along major rivers that particularly large numbers of people live in confined spaces. like along the indies where the in pakistan home to millions of people. it burst its banks in september 2022 and the flood destroyed houses ruined crops and resulted in death. but can we learn from flood catastrophes by doing research on them? it's only a matter of time and before the next flood waters hit somewhere. this was the r

valley in western germany. in july 2021, 200 leaders of rain per square meter fell on to already saturated ground. the massive amount of water destroyed everything in its wake. the natural disaster ran its course, but how did it get to that point? did authorities miscalculate the danger? only a few weeks after the disaster in the our valley flood water researchers at the causeway institute of technology published a report which stated that the flood risks were clearly under estimated. ready oh, come on and one on time was a video fix. some of the residents sent me videos. and in one of the videos you could see the water gushing out of the back of the out in our tunnel behind it. the entire street had been washed away. yeah, there was nothing left i had unwell working on the flood report. we looked at the historical records and there was actually a photograph from the 1910 flood. and i can hardly believe my eyes. it seemed to

look identical for cystic. lot of the fact fruit it enters all was 52 people died during the flood of 1910, and that wasn't the 1st time in 18 o 4, it was even worse. back then, an estimated 1200 cubic meters of water per 2nd raged through the our valley. about the same volume of water as in july of 2021. that's according to the calculations of multiple research teams. neither the historic flooding in 18 o 4 nor later disasters in the early 20th century were taken into account by the flood protection authority. their research was based solely on measurements since 1950 is historian i. these historical events are partly based on estimates that you don't have any real measured values. so they're incredibly difficult to include in the statistics. you just don't do that often. at least until now,

directly after the disaster in the our valley, in july of 2021. the environment office in the state of rylon palatinate announced that it would investigate whether or not historical data could be included in future calculations. and sure enough, earlier this year, the office announced that maps detailing flood risks would be updated to include the additional data. but past floods aren't the only factor to consider. over the decades, the r valley had become more built up, so the flood waters couldn't spread out in the same way. meaning water levels rose a lot higher as this house and down now shows the historic flood level from 18 o 4 is here. in july 2021. the level was much higher. even though experts say it was the same amount of water that flow through the valley. just eventually 2021 was so damaging was mostly due to the buildings in 18 o 4. not as many people who lived in the r value to come in. the area was used

differently, and there were fewer building signals from alaska, about 200 years ago. very few areas along the river bank were completely built up. so the water wasn't hemmed in. and 2021. the water had less room and flowed higher . instead, that effect was compounded by drifting debris which blocked up entire bridges. they became like dams, blocking the water with fatal results. professor and nestor, who has rodriguez from the rhine. mine university has used models to simulate what happens during floods. he's convinced that the threat posed by black bridges has been under estimated a film of his orphan. it would be like me placing a plank across here, water levels and flow rates would change by several 100 percent me. the water would seek a new path and rise to new levels accordingly that these are scenarios that communities may not be prepared for the mountain dome. said me, for the love scenes that played out in real life in the, our valley causing damage. it is still not been fully repaired. so how can people

here protect themselves in the future building more permeable, bridges that don't clog as quickly would certainly help. but that alone won't be enough. which houses should be rebuilt and which shouldn't. it's not an easy decision. yes, i met a colleague in canada once kind of showed me the flood plan he was working on. is it involved moving a whole town 5 commanders back from the river kellum in canada? that's no problem because there's lots of space, but it would it be unthinkable. here is home. one thing is clear, most of the houses and the narrow our valley are being rebuilt according to preliminary maps of the 9000 houses that were destroyed in 2021. only 34 aren't being replaced. i see it from the viewpoint of a disaster researcher who has lots of experience with natural disasters, with land, from my point of view as the flood protection measures being taken here are far too

weak. it's a climb and it's only a matter of time until the next extreme weather event hits. climate change has increased the threat of devastating floods and the risk is only set to grow. when the next flood comes, people need an early warning, so that lives can at least be saved and the worst damage avoided. in the summer, extreme heat can make life in the city unbearable. over the past 30 years, reason it is of lifted air temperatures and humidity in more than 10000 cities around the world. they found that exposure to heat has tripled. something has to be done, but was living

in a concrete jungle can feel like being trapped in a waste land, bland, lifeless, and very hot in summer. but this high rise is going to be different. the entire 15 story facade will be covered from top to bottom, with plants, the projects in downtown munich ames to create green living for more than a 100 people. the greenery will have a cooling effect in the summer months and reduce dust particles in the i. plants that grow 50 meters high, kilian lincoln has been planning meticulously to ensure it walks as, as we olivia. but it's definitely achievable, we just have to come up with detailed solutions. there are a lot of structural questions and questions about fire safety them the amount of wind up building can withstand is critical. the conditions you have at certain heights play a decisive role. but in terms of construction, it's similar to what we have this commercial building and frank fat as being covered with clematis, japanese such honey. so oh, and of the types of plants?

yes, i did that. and here of lanfield today we're covering the sand with greenery. so the construction part of the project is essentially finished and we've reached the point where we can add a bit of life to this building. the most exciting part of the process. after years of work, killian lincoln and his colleagues have identified $300.00 types of plant suited for such projects. depending on a buildings, location, and surroundings. they've also developed various structures to safely attach plants to the facade. hair trucks affects to a frame on the wall. the plants are tied in such a way to withstand storms. the trucks hang above each other. that way the plants only have to grow 5 meters high to cover the entire facade. the plants are watered by a trickle irrigation system and

a substrate provides them with nutrients. all of this costs money between $500.00 and a 1000 euros per square meter. but kelly and lang and says it's worth it. vanish are all on over as men, like most people, when i need to recharge, i'll leave the city and head out into nature. i'd like to feel see, an experienced nature in the temperature is cooler, the air is better for the sake of the feature of our citizen. we must reach the point where we bring nature into our cities and because it is possible vices, mirkwood. the occupants of this building are hoping the greenery will create a cooling effect next summer, when it will look like this. the green walls aren't just that to improve the aesthetics. as plants provide shade and evaporate water, they also call their surroundings a benefit that is particularly important due to urban overheating in this era of global warming. similar efforts are underway in

singapore. the architects of the i wager hotel designed it so the parts could cover the entire facade of the $27.00 story building. the plan is that 25000 square meters of greenery to eventually grow on its exterior. the facade is already 7 degrees cooler than the surrounding air and $25.00 degrees cooler than nearby buildings. the concept has yet to be used on that scale in germany. but kelly and lincoln at his colleague melon, up already at work on plans to cover a 60 meter tall building in dusseldorf, song on hulu, them or for them when the building will house apartments, officers and restaurants are for work, living and leisure activities, all in one space with a bit of added cream flag. as nice as that sounds plants of flammable

designers have to take into account the increased fire hazard created by covering buildings with greenery. that's why killian lincoln and his team have to pass fire safety tests. here for example, the flames might be high, but they don't spread the defect office custom. what we found is that fire only he did this structure a hanging rear ventilated facade to a temperature of $270.00 degrees. that significantly cooler than a building that isn't covered with greenery. the water contained in this structure actually caused the facade of the building. in other words, it protects the facade from more severe fire damage on its own switch the shoots honesty. posada duff wanted target on johnson him. green facades could be a model for cooler cities in the future. even if it's going to take some time for them to become more widespread,

all over the world, people are building for decades. the motto was lots and thought and preferably with concrete. in the meantime, architects and city plan is have realized that building needs to be sustainable energy efficient and environmentally friendly. but so does the use that building living in so called whole apartment is a new concept. these pieces of mobile furniture are almost complete. eva, maria cooper and mathias ventilation are moving into their new home and the coming days together with their 2 children. but 1st they have their work cut out for them . it was the whole world. the mobile stairs are needed to reach the upper floor book, but they also serve as a closet. it has their private living quarters will be tiny to so they need to

maximize their use of space digital stuff. but they can't wait to move in in hollywood on it. i mean, we realized that a hall like this would give us the greatest flexibility and options as it was, were freely design our living space as we want. and when you have more freedom, you come up with really cool ideas. lee lacy, the 2nd, the 4th. i don't think you than me there. often we have everything here. we adults can design our home as we want that handle, but the children also have their ariana thing, their god, they have their kindergarten here, and their friends are here in the same place. north films really get ya, mc a, pull the hall measures 275 square meters. a large part of it is still a construction site. various pieces of furniture are in production, some made of bamboo. the space will be home to 11 people. in addition to communal areas like the kitchen and bathroom, they will each have their own private space with the pieces of furniture measure

just 9 square meters, and they're on wheels. that does a stephen roll concept them, that's the idea behind these movable spaces. if you want to go over to the other corner, you can just roll over there. it's fun. and each time you move the design of the room changes, we offer the cloudy, se exalted. there are 8 halls in total located inside this building near zurich. main station, the complex also houses another 50 apartments as well as small businesses, a theater, and a kindergarten. andreas b letter is overseeing the project. he says the set up also makes sense from an environmental standpoint. as it makes better use of urban space. in general is about to call by building upwards. also with your furniture, you need less living space per person from his plan and our pro hope nor of any good plots. brutal and saving space is the most efficient thing to do. if you want to build in the, when we said, oh, green and c resources or go over sources,

pardon the bin will bow and on corner. so is this the model for the future? is it what dental? carmen? freak from the god leave. do violet institute an independent think tank near zurich and switzerland says as a real need for creative living solutions, north rock north, naya von form and warn expert in the lot of demand for new forms of housing and experimental ideas, and not enough on offer. now on to the 2nd hour. now, with the pandemic, and many people working from home that the chance that more space will become available in secret. so office areas that are no longer being used to provide space for whole style apartments or other housing experimental should high level warner audit. on the, on expert, he made the cell phone, van lucas, the land. it would be nice if people who would like to live this way had the possibility to do, say, to my one, if they weren't just for room apartments on offer. it sometimes hard for families, luxury of acre duty,

the food hall apartments are now also available in the swiss city of ban. perhaps it's just a matter of time before the idea catches on elsewhere. coral reefs, on whom to thousands of plant and animal species. but their habitat is under threat 1st because of climate change, the average temperature of the sea water is rising. this can lead to so called coral bleaching and the death of the re large amounts of fertilizes and the sea water. also a problem. this is because they caused too much ality to grow, which deprives the corals of the life they need to survive. and then there are people who want to have colorful marine fish in their own homes. tropical coral reefs are considered the most diverse ecosystems on the planet that the rain forests of the sea, their inhabitants uniquely beautiful. and that's exactly what's putting that

hobbies, hot and danger. these tropical fish are being hunted for the trade and decorative aquarium fish swiss to ologist, monica biando from the france vapor foundation for species protection has been researching the industry for years delayed and founded that caught alan fish in the hobby touch of these core fish is as everyone knows, extremely endangered. and if the coral reefs disappearing done, hold a 3rd has already been destroyed, and yet popular, taking a millions of fish out of the reefs to be kept on aquariums and health. they have no idea exactly how many they're taking and what consequences it's having for the reef. it has caught all in that in 2016, her research took her to su, noisy and indonesia, where she saw people hunting apprised, bang, i called, and will fish. they live in small groups, seek protection among the corals and plants, and are easy to trap in

a fishing net that's time. these called all fish into an endangered species for the community hunting for tropical fish as a welcome source of income. but the consequences for the ecosystem of coral reefs could be fatal, escaped on pursuit when from iceland, fission is close. being studies done on individual types of fish, calling from the cleaner ross. as for example, they picked parasites of bigger and smaller fish and seen. they're like the healthy spikes as of the revised quote all in that a 5th. when one hop on to soon came off per month, there was an experiment where they took out all the cleaner roses expertise. and the house of the coral reef really did break down on a number of species, declined on every fish in the color reef, plays a role euthanize. so it's important to understand what happens when you remove these fish from the environment. so can boss proceed by monday, sufficient household meet them. laban found research shows that between $40.50

coral reef fish end up in aquariums around the world each year. it's a long and often deadly journey that klein officious aka hits moll dead fish. he said as some one fishing on a small scale in the north of barley, i for though fish for different species and take them to an intermediary that had thought that the fisher put into plastic bags and kept at high temperatures, tropical temperatures, lorden is not clear how many folks die in this processor, but the rate is very high. it hawkins, is it in the city? then they go to the next in amy tree and so on until they reach the exporter. and only that person knows how many fish are being exported to europe or pot export via an estimated $4.00 to $5000000.00 tropical fish and up in european aquariums alone each year, summer imported by e fs, a wholesale tropical fish retailer in the southern german city of his honor felt

the company receives $2.00 to $3.00 shipments a week, but between $3.50 fish each week, and more than a 100000 each year. these fish and plastic bags have just travelled some 9000 kilometers by playing stefan smoke se, and his father bound a pin in the business for more than 30 years. they know all their suppliers personally. their company is one of the biggest tropical fish importers in europe. the sensitive coal refresh need a lot of care that includes specific lighting and their own special water preparation. to ensure the new arrivals survive, chef, unquote, saying 1st gets them used to the home, made salt water then comes a week and a quarantine tank. it's a lot of work, but business is booming. deborah, gov is an individual demand has gone up because people want your own marine animals, your home, listen and the technology and equipment to keep them has become

a lot simpler and more affordable. i am for her grants to give ordinance. steph, unquote, saying is project and gross if more than 10 percent this year. that would mean e f. s will soon be selling half a 1000000 marine animals annually. but buying your own underwater wealth is anything but cheap. a well filled aquarium can easily cost about the same as a small car. a single fish can cost several $100.00 euros depending on the species origin and its own unique beauty. thus, before you've added the corals and other marine life for your own little slice of the ocean in your living room, those who don't want to pay such a high price come visit their local aquarium. but here to almost all the creatures on display have come from the wild. if an aquarium fish dies,

chances are it will be replaced by one taken from its natural habitat. study show that the uncontrolled catching of fish in the wild is endangering the stalk of at least 10 types of coral reef, fish expanse lexie. woah. just monica biando, according for the industry to be regulated, then monday's, the better or to corral and that if, when you know how endangered the cold reeves aren't, that it really makes no sense for this industry not to be regulated because we should know where the fish are coming from holland down to the exact location where they're cautious. regulation of the tropical fish trade in europe, and better control locally where the fish are caught. neither would spell the end of aquariums, but they could help better protect extremely sensitive coral reefs. because without these unique ecosystems are aquariums will also soon be empty. ah,

if i was let is read why i hate to hear the science clifton. send it to us as a video, text or voice message. if we answer it on air, we'll send you a little surprise as a thank you. come on. just does. this next question comes from to mary's alvis rodriguez from brazil. why don't the moon in the sun fall to the earth? gravity pulls us towards the ground. the more mass a body has, the greater its gravitational pool, but the effect decreases with distance. however, gravity can be overcome and a carousel. for example, the faster we spin, the stronger the centrifugal force which counteracts the force of gravity. satellites and the international space station orbit, the earth so fast that the centrifugal force almost completely cancels out the

effect of gravity. if the 2 forces are balanced matter becomes suspended. the celestial bodies within our solar system are also constantly moving. the planets rotate around the sun. if a center, the balance between gravity and centrifugal force keeps them unstable. orbits. mm. planet earth hurdles through space at 30 kilometers a 2nd. at this speed and distance from the sun, the earth moves on a stable orbit and a perfect balance of gravitational pull from the sun and the centrifugal force pushing us outwards. the moon isn't stationary either. it speed stops it from crashing to earth. and the earth's gravity keeps it in orbit and the sun, with its gravitational force, keeps all the planets of our solar system in orbit. and our solar system orbits

around the center of the milky way at 220 kilometers per 2nd. nothing in the universe stand still. that's it for tomorrow to day d. w. science shall be glad you could join us see again, next week till then tuesday period with ah, with

ah! a with a looking back at a major world events. june 1953. a global audience of more than 100000000 people watches the coronation ceremony of the young queen of england live on t. v. a sensation. a bold decision and

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de leon, shattering the glass ceiling women in architecture. this list has to be really, really good. start september 30th on d, w. ah ah, this is d w. news live from bill that queen elizabeth the 2nd is laid to rest. the british nation mourns as the light monarch is buried in the royal bulk of the chapel and when to cast the ceremony followed the funeral service attended by dignitaries from around the book also on the program.