well you. stories people world over information provide. the means they want to express g.w. on facebook and twitter to date and in touch. well come to me to morrow today the science show on t w. despite our best efforts we still haven't discovered life on another planet not many fulfill their requirements for humans spaceflight is a risky business to smart dummies when hope is not wished exactly how dangerous it is. water covers much of our planet.

it also fills much of our body. we couldn't live without it it serves a whole range of vital functions. highrise vegetation is trending planets clean and cool the air but how do you water a garden in the sky. cosmic radiation from space is something else it's all over the place and it's heading for us all the time luckily earth's atmosphere shields us from a lot of it. how much of it reaches the ground depends on the elevation. near sea level as in hamburg it's not so much it's a lot more in mexico city at over 2000 meters and it really goes up on mount everest and in the plains up in the sky.

what about astronauts how dangerous is it for them. the german air space center in cologne has 2 new recruits waiting for their 1st full image into space. and soha are what their makers call human phantoms. physicist thomas bag-o. wants to deploy them to find out how dangerous exposure as a cosmic radiation is faster not just taking a trip to the moon. and making the phantom is a replica human it's an ideal test subject for measuring the effects of radiation on one form of carbon misinterpreting. the medical dummies comprise a stack of contoured layers each containing plastic replicas of human bones organs and tissues.

a range of different density materials are employed to reflect the diverse structure of the human body. the premiums are more garden the problem with our organs is that disparate levels of sensitivity to radiation the blood forming organs are far more sensitive than our skin. and to find out how big the risk is for an astronaut in outer space we have to know how high the radiation is on the surface of my skin or in my lungs in my reproductive organs and my spinal cord for ransoms were gone and. mark. special crystals are placed inside the dummies to measure the exposure to radiation jaring a spaceflight. each

dummy has over 2 and a half 1000 of the crystals distributed around its body. the measurements generates a 3 d. model of the radiation dose absorbed by the dummy showing how much each organ is exposed to. the invention abel's the experts to determine the potential risk of cancer for an astronaut traveling to the moon. or in the 1st time we enter interplanetary space with a phantoms and the other will be measuring radiation in the spacecraft built specially for these research trips to the moon it's unprecedented. for the bundle of the orion spacecraft bell also be conducting tests for another radiation risk it only rarely occurs but it's a serious matter for astronauts. radioactive proton storms on

east into space by solar flares. this nasa video shows how astronauts should react when a proton storm is headed in their direction. they build a protective shelter made of blocks filled with water or plastics where occupants can take cover until the storm has passed by. another option would be a radiation protection vest. one of the 2 dummies manning the upcoming arayan flight will be wearing such a vest for test purposes for physicist thomas bagger helga and so has mission is a unique opportunity of the consequence. their concern is of course in a word it's cool that's worked through for it so much fun of putting this interim back to it's great to see us being able to send helga and so hard to the moon and

bring them safely back to earth for but we don't if you're. so exposure to lots of radiation means the risk of getting cancer is high if humans wanted to colonize space they would need a lot more than sunscreen. but what conditions are required for any form of life to emerge and survive whether here or elsewhere. that's the subject of a question submitted by one of our viewers. which planets other than earth could support life. our planet is home to a remarkable diversity of life. life as we humans define it requires certain conditions to develop and flourish.

it takes a combination of numerous factors for life to form. for billions of years the light emitted by the sun has provided a stable environment for life. the earth orbits the sun within a zone where temperatures are just right to maintain liquid water on the planet's surface. orbital region around the star in which a planet can possibly support life it is called the habitable zone. earth too close to the inner edge of this zone its water would boil away as steam. and if it were too close to the outer edge its water would freeze solid. astronomers have identified over 4100 planets orbiting distant suns exoplanets.

the nearest known starch of the sun proxima centauri is orbited by a planet called proximo being within the habitable zone that means water could exist as liquid on its surface. most earth like in terms of size and surface temperature teagarden be is high on the list of potentially habitable exoplanets and then there are planetary systems like trappist one this stars orbited by 7 planets of which at least 3 are in the habitable zone. some bodies in our own solar system could also potentially support life such as the icy moons of the gas giants jupiter and saturn they're outside the sun's habitable zone but below their surfaces our oceans that could be home to life protected by an

icy crust. if outlet is right why ave platinum even if it. do you have a question about science if you do send it to us as a video text or voicemail if we answer it on the show we'll send you a little surprise as a thank you so come on just ask you can find us at d w dot com slash science on twitter at d w underscore sign tech and on facebook at d w dot science. earth is unique. our lovely planet boasts more of the. could water then any other astronomical object we have found so far. and since we're talking about water did you know that it not only covers more than 2 thirds of the globe but also

makes up much of our body why is water so important to life. earth is covered with water h 2 o. one oxygen atom and 2 hydrogen atoms. most of the water on our blue planet is found in oceans. bound on land it's also in rivers and streams and lakes just built up other than space looks bone dry but there's thousands of liters of water hidden here too in human bodies. up to 65 percent of the adult human body is water. by young body is as much as 80 percent water we lose water as we age. the body of an older person is around 50 percent water which is still a lot. that means that adults lug

a good 45 liters of water around with them it's an important structural component of the body our cells like the rest resides in our blood embedded in watery solutions the cells would shrivel without it. steve our muscles would travel by 70 percent without water. and that wouldn't be much left of our brain either the brain is also about 70 percent water. it's impossible to imagine what we'd look like without water. the water in our bodies has further vital functions it helps to transport nutrients and oxygen to all the cells of the body through channels like the blood vessels the plasma the liquid part of blood is mainly water with dissolved substances and cells in suspension including immune cells and the red blood cells that carry oxygen

around the body. water also helps the body remove waste through your anation for example. the kidneys use water to flush out excess waste materials. approximately 100 half liters of urine is excreta from the body every day fire the bladder. it's important to keep the body well hydrated we all need to drink a lot every day. water is a solvent and urrea agent. in the body can only process vital substances like salt with the help of water. water helps to break down food says. the body can absorb the nutrients. water is

constantly at work throughout the body. our metabolism needs water to function. water plays another important role in the summertime. it cools the body down. when we're too hot to sweat glands release a salty fluid through the pores which then evaporates on the skin. this process known as perspiration helps the body stay cool. that by maintaining body temperature. without h 2 o. human beings couldn't survive and not just humans without water there would be no life on earth. as

long as we have life and water and the earth we think about the future we asked you on facebook for your ideas about sustainable architecture. michelle taylor thinks in the future houses will probably be floating on water and can be moved from one place to another without needing any other vehicle. to. map more from indonesia wrote to say his motto is back to nature he would like to build a house on a hillside with a view of rice fields filled with sustainable timber or perhaps a tree house. dimitri arrives we shouldn't need a house we will be living in a virtual reality forever now that's pretty radical. david erling writes it would be nice if each house had its own power. solar panels batteries wind power etc that would be

a step in the right direction. to embryonal likes new technology. 3 d. printed and not just out of concrete we could melt garbage to make plastic bricks or breaks out of fungus. wow thanks for all your interesting ideas. construction is booming in some parts of the world increasing prosperity and population growth are mung the drivers but an awful lot of natural resources are consumed in the process the supplies are finite and the environmental impact is often problematic so researchers are looking for ways to use smaller amounts of raw materials in architecture. based researchers. and inspect a concrete roof element on display outside the institute for lightweight structures

and conceptual design it's semi hollow but still stable their teams aim is to develop concrete components with less mass thereby conserving resources the idea seems simple enough they take freshly made concrete and pour it into a mold. it's then turned into a hollow ball by spinning the mold while the concrete is drawing. rivers. the researchers then prize the results of their work out of the mold. and presto a hardened but hollow concrete ball. into the idea is for us to position the poles in the relevant building component that's going on because they have an air cavity we save between 30 and 60 percent material in the component. of. the researchers have come

up with an ingenious way of getting the finished balls into position simply pouring concrete on to them won't work the balls rise due to the air inside them. so the ball on the left was set in place before hand with concrete ensuring it stays inside the box. the construction will not break unless it's subjected to extreme stress. the roof of the institute is a precursor of the more famous construction spanning munich's lympics stadium. the lightweight and yet stable structure is a source of inspiration for the research done by stephanie vide and now. they want to use actuators devices that move parts in a system to further increase the stability of constructions that are low in weight

and in resource utilization. hazardous forces flow off via the actuators in a similar style to of lightning conductor. the same principle also works with facades exposed to wind and storms. once the actuators are turned on they dampen any excessive and potentially dangerous fluctuation. to a middle class with a band a thumb and areas of application could include office high rises which have a lot of facade area and a lot of mass they fear for flesh you have and if you. must the football top and here we can say you can decrease the amount of special material needed by deploying intelligent systems such as hydraulic actuators pneumatic actuators all fluid actuated we believe this will revolutionize construction in the future.

slender but stable constructions thanks to smart engineering a 2nd option for conserving resources. tomorrow's homes are increasingly resembling today's cars in terms of manufacture with a shorter lifespan but recyclable. horrific. with people moving house more frequently will either buy houses like we do cars were build houses like we do cars and then run toward lease them out increased mobility among the population will lead to a more frequent change of home compared to the previous century with. a vision of future construction faster cheaper and greener but no longer built for eternity.

been a zation and population growth are putting massive pressure on cities around the world. cities can be cool places to live but they can also get berry hot literally . in urban heat islands she gets trapped the problem is compounded by global warming one way to make. it is more livable is to plant lots of greenery. when green replaces gray and skyscrapers start to look like vertical forests architects unnerving planners have realized that these living walls are a way of making cities look a lot more attractive singapore is just one example. and greenery isn't just nice to look at it also has environmental benefits exactly what those are is the focus of hunger vax research he and his project partners attesting the walls to figure out which plants are best suited to them. as in here what we

see here are sense and they contain measuring units this here is a small window a sensor on a 3rd and behind it has 2 little permeable grades that allow air to reach the sensor and we measure temperature humidity and air pressure in with talk the cables run through the vertical garden and into its immediate surroundings the collected data is fed into a mobile measuring unit. it shows how much greenery alters the surrounding microclimate. coppertone this is what we call the cotter model and the data we're looking at right now show that the walls temperature is significantly lower than the immediate surrounding us by about 4 to graze further from. the gable when the weather's hot plants emit lots of water vapor which cools the surrounding air this is useful in cities where

temperatures in summer are generally much higher than they are in the surrounding countryside well normal stone or brick facade store heat green ones have a cooling effect. but high temperatures can also dry the plants out. keeping the greenery well watered in vertical gardens requires customized solutions. on this test wall in western germany the building material itself plays a role in the irrigation system. and not reported by the advantage of calcium silicate building stone is that it quickly absorbs and releases water and we take advantage of this by watering the manufacture stone which then causes it humidity on to the substrate that optimizes the irrigation of the greenery. pretty surprising that stone is helping nature to flourish in cities

. here the importance of open green spaces is becoming increasingly clear parks provide benefits that 30 called gardens can't but both help improve our quality. tiny openings in the undersides of leaves allow plants to absorb nitrogen oxide and carbon dioxide from their surroundings. and to release oxygen. in this way plants act as both filters and africa providing a valuable service in cities where the air is often loaded with vehicle emissions soot and other micro particles. green walls can even make industrial zones into healthier and more pleasant places. this firm makes a stone elements for vertical garden irrigation systems. this free standing wall helps filter toxins from the air. just cut off by shops lined up because of the

large fine dust that collects on surfaces like these people if you look at the surface of the leaves you can see it all. of the green surfaces also provide a habitat for insects and birds and microorganisms that have no other natural habitat in and industrial. little limbs on. so this manmade system provides them with a place to live. in the in farm fields. for the last 3 years the project partners have been experimenting to see which plants are likely to flourish where in a vertical garden. south facing walls can develop an almost mediterranean character even in an industrial zone. the look i think of the side we get most solid here i south facing sidewalk so we have been experimenting with herb's. we've tried our various things we've got basil meant

a lot of aged from our tomatoes garlic chard and a lot more. our colleagues really enjoyed harvesting at all but the. vertical gardens are designed to bring pockets of nature back to cities. urban planners have long appreciate the value of horizontal gardens. rooftop gardens might have a negligible effect on microclimates but they're great places to grow vegetables or just hang out. vertical horizontal it doesn't matter greenery is a valuable addition to concrete jungles. that song for this week. on the next show would be looking at beautiful fire salamanders there are native to forests in central europe and they're in danger of

fungus apparently brought in from asia is decimating their populations. is the entire species at risk. biologists are searching urgently for a solution. join us for that on tomorrow today until man bye bye.

thrown into china's cultural revolution. the red children. born to immigrants who had come to help build a new nation. raised to be loyal to the regime and devoted to the great townsmen man was a don't. until the persecution of their parents it was that lines to the truth. childhood undermount. in 16 minutes on d w. i

cried. gemini with doubling and any time any place. the news video novellas. had of the back of the car. songs to sing along to download it is the come from super fun seats to the tire guy. and various causes cliff into active exercises the hard thing about that deep down you don't come slashdot atlanta on facebook in the app store. glen jam in 5th grade with the deafening. they were forced into a nameless mass. their bodies near tools. the

history of the slave trade is africa's history. describes how the greed for power and for profit plummeted and entire continent into chaos. violence the slave system created the greatest player and accumulation of wealth the world had ever seen up to that it took. from its very beginnings until this very day human trafficking the be. this is the journey back into the history of slavery i think will truly be making progress when we all accept the used to be of slavery as all of our history. our documentary series slavery routes starts march 9th on t.w. .

planet. plan. this is the tell the news live from the security forces in thailand storm a shopping mall and be calm for a gunman the man a thai soldier went into hiding in the mall off to a shooting rampage police say at least 20 people are dead in schools more wounded and he opened fire shopping center in the city of kut it's also coming up gemini's federal coalition parties called for fresh elections in there in just talked to a far right political scandal in the east and just one state that.