red alert. ah, this is a just route. this is a rid if occasion. i think we're going to have some epic fighting for the warning router is becoming a scarce commodity. things just getting dryer and dryer and we need more and more water is omar. earth die of thirst? there is no water. no global struggle for water. thirst starts august 10th on d. w, with why to a professor and his students keep going to a forest to inspect dead pigs. what are the repercussions of our hunger for energy plus researchers shedding light on a stone age? who done it?

ah, well come to, to morrow to day. the science program on d w. b survey show that on the risk front were especially afraid of crime and accidents. but actually, we should be more concerned with less visible dangers, such as cardiovascular disease because we eat too much and exercise too little, which is pretty much the opposite scenario, tor stone age ancestors. because they had to move around a lot to find and kept their food. although what they should have been wary of worked fellow humans with less than neighborly intentions. on and lower leg bones broken by blunt force. skulls pierced by arrows thousands of years old

bones that testify to a brutal crime. does this on the edge of a fall. this is an elderly woman from ihnen, but, and if you look at the scarf in the inside us, if you can see that the arrow hit with such force that a piece broke off inside the skull to pick a blotch, this, ah, the bones come from a cave high up in the spanish pyrenees as trucks. for 10 years, archaeologists have been working there on the reconstruction of a blood bath from thousands of years ago. german anthropologists quote arch has been there from the beginning and is responsible for analyzing the human remains. natalie was and of course there was a very big surprise that something like a massacre took place there. cost of the excavation work is arduous. the archaeologists are removing tons of earth from the cave. the rubble

they hope contains information about the events long ago. down in the canada, the mud is saved and washed. in addition to animal bones and countless pieces of pottery, the researchers gradually uncover bone fragments of 8 individuals. for adults and 4 children, all of them were brutally murdered. that isn't as the of oxen, another shopping ruin. we know that all the adults were shannon we can prove that with the bones of norfolk and then the bronze are also broken. deacon doesn't even foster storm. the children also died by blunt force, and then their bodies were taken to a cave and just left their door types leading lawson born. but who were the murdered people? back in the laboratory at the danube university comes caught out and his colleague nicole nicholas, take a closer look at the bones 1st. se, anna,

i's. dna from the inside of the temporal bone does eat modestly. peer, you can see this pots from inside the skull. if the skull is well preserved, this or the bone is well protected and it's better from a dna preservation standpoint, as opposed to an arm, leg, ribbon, hand, or foot bone. one result of the dna analysis proves these people weren't from the region. about 9000 years ago, farmers from the east settled in central europe and eventually in what is now spain, we hate dead as throats were descendants of these early farmers, but they were not alone in their new homeland. they encountered native hunter gatherer groups were the date of as trucks, victims of a bloody conflict between 2 completely different clans. a so called isotope analysis of bones and tooth enamel should help solve the mystery

. it reveals how these people fed themselves that's on smith's tinge under the enamel that i find on this specific tooth that will tell me what this man aid for the 1st 4 years of his life. in an instant, fia lindsey acted as tooth enamel doesn't change after childhood. the chemical composition is therefore a piece of the puzzle about childhood nutrition. bones are different. they tell us what people 8 in the last years of their life. because bones renew themselves completely every 10 years. but what does this tell us about the dead of as trucks? 7 of the 8 individuals had the same food spectrum in their youth as when they were adults. only one had changed. he had probably migrated from central europe than the course of his life. probably most of the immigrants were already living in 2nd or

3rd generation in what is now spain. but what were the people doing up there in the mountains where there's virtually no land for agriculture and the winters are bitterly cold. the researchers hazard a guess the 8 individuals were shepherds who drove their livestock to graze in the mountains. this is supported by the fact that the group consisted of older adults and children. while the young and hard working part of the clan cultivated crops in the valley, the old and the children moved with the cattle to the mountains in summer, but who murdered them? so brutally, so far the archaeologists have not found any traces of the perpetrators in the cave . nevertheless, court out has an idea. this is not what is navina, who portez? it's just our hypothesis. of course, on steve o'shaughnessy cut courses, it's more likely that these early farmers encountered hunter gatherers who kill

them up. their lessons went on, thus dizzy closet and on good golf top about olm bus. once we came to that conclusion, due to the brutality that took place at a spot before, not, it's also possible that the perpetrators were farmers. but would they have been so efficient and brutal? if there were any bones of the perpetrators left behind court out could solve the mystery. but as long as none are found, the else truck's cave is keeping it secret to itself. solving crimes is often in uphill battle, but over time, investigators have had access to a growing box of tools. in the 18th century, foot shoe and huff prints were used to identify parties to the crime scene. as science, advanced investigator started to seek more advice from experts such as doctors and chemists wanted photos,

enabled suspects to be identified and arrested within a matter of hours. and once fingerprints were determined to be one of a kind they to were used in forensic investigations. the 20th century saw growing number of perpetrators using fire arms. soon enough, experts came along who could say which gun fired the little shot. and now computers and dna analysis are also helping to track down criminals. but it's still difficult to clarify one forensic question. the exact time of death an old military site near moonstone in north western germany is hosting an unusual training course today for forensic biology, students and instructors from the criminal police unit. they're going to learn 1st hand how corpses decompose and what traces they leave behind. by us is on dish mailed like

a white board and i got also likes how warm it i guess you could say, among other things is with one hand and white board not very nicely so nice a few weeks earlier, preparations began for this unusual outdoor experiment biologist ins amens from the institute of forensic medicine in frankfort is using pink carcases to study the decomposition process. the league, yes, wine icon novels. we lay the carcasses out here, go for the i'm vocal, but some of them are inside the tent and some are out in the open desert. we want to see if the caucasus decomposed differently at different speeds. for example, because there's more moisture in attend life, but maybe it's harder for insects to get to them. so i have no one knows exactly how corpses in germany decompose under the prevailing climate conditions. yes,

our meant an expert in forensic entomology wants to obtain reliable data. this could help in determining the time of death, for example, which is crucial for alibis in murder cases. the problem is that if the results of this experiment were ever used, their reliability could be called into question. isn't limited seen distortion medicine. it's very common to use pigs as a model to understand what happens in the human body. all but in court. and they might ask you, how certain can you be that this would be the same for a human corpse of life? so it would be good to get some data on human corpses to also be an it's going to this and forensic scientists have sometimes referred to findings from the us so called body farms have existed there for years. scientific, corpse gardens, where researchers lay out human bodies and investigate which insects colonize them and when or how the environment and whether affect the decomposition. the resources

in europe are much more limited, was gib so i know one does one in amsterdam at the university hospital with this area of land has been cordoned off sooner, but it's very small cuz we're not much bigger than a tennis court. also goes into and the other downside, as you can see in the next picture, is that the bodies have to be buried. we need an airy that allows us to carry out experiments above ground, the mucus, in all the various conditions that we have in central europe. little obama, georgia, experimental over edition. so i'm, it's vision for the future. is clear, a body farm in germany for the moment. however, what matters to the researcher is the results from his experiments with pegs to sophia among the does, what we are doing here is being done for the 1st time. and that's why i'm really excited, and we also want to use the opportunity to support police and let biology students

really experience what decomposition means voided. over the past 3 weeks, nature has done its work on a paid carcases with. now students of forensic biology and police instructors are working together closely. it was perform hoping to gain insights for their work and for this order. so all the criminal officials, we think they could load us against edison. i honestly didn't think the trial would result in a bonus skeleton after 3 weeks and unskilled through evolve mission of russia. here, man for domains we investigated, don't have much time if you type in practice. criminologists and forensic experts rarely have to deal with comparable decomposition. but when they do, it's always necessary to clarify whether the crime is a serious one, such as a murder,

and 2 thirds of the corpse is infested with insects or found indoors. any sage canal, none, all insect can necessarily get into the tent or even larger animal. i'm listening. that's by i would have imagined something like that. on the other hand, i thought it would be faster because it would be wal, my eyes. now the students have to secure the evidence. they need is that the maggots flies and beadle is found on and under the pay carcass. this is because their type and stage of development provide clues about the time of death and whether the place where they were found is also the scene of the crime. fizzing us, we are seeing that decomposition is slower in these tense than it normally is. this is the empirical data that we lack so far biting in contrast to the exposed pigs by boat has formed on various areas of the body of the 10 pig. and we now have taken swaps to see what kind of mode it is. bosses from chima pants is important findings

that can be decisive in real cases, but one thing is clear, the result here cannot be transferred one to one to humans. must. the criminologist, of course, is not interested in the decomposition process of a peg, but of human bodies mentioned among couldn't to term a forensics perspective. we could actually learn on train of body farms like this using tim yule them thereby solving real murder case is better. so why are there no body farms in germany? ethical concerns, legal hurdles, ins i'm and beliefs. there are solutions for all of these. he's even been offered land and body donations. however, facility my body farms dropped on the idea of the body farm hasn't worked out yet because even though i keep seeing signs of interest, i always end up organizing everything myself the most. that means what we actually need is to get a real commitment from all of this interest and good, intentional smalls become. but until then,

decomposition researchers in germany will have to make do with peg carcasses psychologist say we're afraid of a lot of things, but not necessarily the things we should be afraid of. a lot of people underestimate one of our biggest problems, climate change. scientists believe this is because it's a complex matter. consequences are manifold, which is why we continue to endanger our own future. so far, we only know of one planet in the universe where more advanced life forms have developed. and one species on earth has surpassed all the others in its development . it lives in complex societies and as built up whole arsenals of tools and cultures. but it's a system that requires energy, loss of energy.

the how my for thought to something we tried to calculate and huge study, how much energy the human race has already used and how we found that in the last 70 years. since the start of the and to pacin age, we've used one and a half times the amount that was used in the whole 12000 years before that as of that energy consumption has accelerated. how showing it up? since the mid 20th century, the human race has altered the earth's ecosystem so dramatically that scientists now refer to the anthro posting epic, the new age of human activity. we now use nearly $170.00 trillion kilowatt hours of energy per year, and the global population is growing. it's set to reach 10000000000 by 2015 in our thirst for energy. we are exploiting the planet. if we continue like this, we keep destroying every natural habitat because everything is interlinked,

that becomes especially clear when you look at our food production we've come to the zinc in bag museum in frankfurt to meet falco most bogo. believe who fund or not we live from nature via and each year we're taking more from nature than will grow box and so and so are eating away at the bottle from which we live up the time. 20000000. it's an absurd situation. we're actually destroying energy. we use more calories to produce our food than we get back. meet from industrial farming, loses the most energy up to 90 percent land for grazing and for growing feed, takes up near the 80 percent of all farmland worldwide. we're majorly impacting, of fragile system when these are 3 out of imagine this, apple,

we're our planet early to do with a diameter of 12 to 13000 kilometers full. meaning that is k alta, this skin represents the soil that were effectively drawing the energy from that 8000000000 people are living off. collectors less than one meter hoity, he integrates infant ability. humanities, hunger is insatiable, cheap production methods, mano cultures, and farming for maximum yields, increasingly degrade the soil. groundwater reserves are dropping around the world, including in spain, a key producer of europe's vegetables. the brown community comes, feel are going produce, we is lots of water that we use. fertilizers well and speed things up and boost production, which cuts cause we does everything in phosphate which are finite resource in nitrogen to for the last half of it. and as i rivers and impacts our seas to our

merit, and what's more around one 3rd of the food that is produced and transported around the globe actually goes to waste water in a key for so since the big energy goes less, our group production maternity then you have all the fire tree production limiting on since then the whole area of trans hold and traveling fast, not off the shrink. and so far we've only focused on reducing the big energy cost less in factory likely to littleton in the future. we really need to look more closely at our mobility and not just a big foundry nicholson for picking traffic worldwide emits more than 8000000000 tons of c o 2 every year. that's nearly a quarter of global carbon emissions. then there were other greenhouse gases, but even when we humans don't move around, we still use energy. so far the and it only accounts for one per cent of global

electricity consumption. but if the internet were a country, it would be one of the biggest electricity users worldwide. around 4500000000 people are online. and just 20 searches and an online search engine use enough electricity to power an energy saving light bulb for an hour. the real guzzlers are the air conditioning systems for the big internet servers. they run night and day, including here in frankfurt, one of the world's biggest internet hubs, vic in front of analysis, and we expect the internet to increase to 13 or 14 percent of global electricity usage over the next decade. and that's a huge growth with everything going digital in emit is a constant even just setting up 5 g or les to 6 g, you know, or can seem huge amounts of energy army in lucky with. 2 5, g, and 6, g will provide the basis for data intensive technologies like smart home and self

driving vehicles. the digital revolution is only just beginning all of us could make changes to our daily lives, to impact the earth less. but we also need large scale changes in our economic systems with lang, bethesda 9 am a cellphone contains lithium and lots more usable. we only recycle the small amount of golden it. we need to see these things that have been mind as valuable enough to be recycled and retained in a circular economy in christ loaf behind the line hold. line felder says, a real circular economy is what's needed. we need to learn from the biosphere. the sun's energy is the source of all life. what's no longer needed gets broken down to create something new. nothing is lost in our system driven by money. humanity means to start factoring in the damage it's inflicting on the earth. in germany alone, farmers create 21000000000 euros was

a produce. but compare that with 90000000000 euros and cost. once you include the environmental damage, it's a huge loss maker in industry. been exploring, say the costs are externalized, no one pays for it, them, but society suddenly has a problem with c o 2 nitrogen and the ground water, phosphates and i ecosystems get so shaft move on, so society bears the consequences hot say, and that's the key problem why we need to change in this comprehensive change is imperative if our planet is to have a future. surely the most intelligent of all species on earth ought to be capable of that intelligence helps. but it's no guarantee against getting things wrong. as any psychologist will tell you, we don't really know who we are or what we're really good at. and where do we fit

in between the smallest and biggest things on earth? that's what carlos on friday from columbia wanted to know from us. here's the answer. to our humans small she or are they big blue our height is usually measured when standing up. ringback from the soul of the foot to the crown of the head. humans very in size. so statistics experts calculate averages. the world's tallest men are said to live in the netherlands. also the tallest women. while the smallest men come from east timorese with and the smallest women from guatemala, i compare to the butch calif in dubai, the tallest building in the world. we are very tiny, but huge compared to

a grain of sand. an average sized woman is more than 2 trillion times the size of a carbon atom gigantic. in other words, whether were small or large is always relative. the largest animals in the world live in the ocean, the blue whales they reach an average body length of about 30 meters or as much as 16 tall men compared to other mammals. there are many species that make us look small. in contrast, we're more than $400.00 times the size of a ladybug. there are even creatures for whom we are an entire ecosystem. a whole universe, the microbes around 300000000 bacteria live on our skin. around 100000000 alone live in our mouths and 70 trillion, help with digestion in the intestines. so the question of how big we are can be

answered with comparisons. maybe we should be judged by our abilities. to a large extent, there thanks to our brains. the human brain is a very special organ. it makes us the only species on earth able to pose questions . and that makes us really big. the search for answers allows us to develop theories about the world around us and about our place and it. we expand our senses to penetrate deeper into the microcosm, and at the same time, with our thirst for knowledge, we even try to grasp the history of our universe. it's birth and the origin of all things. if our blood is red, why are they boy, maybe? oh, do you have a science question? i you send it to us as a video, text or voice message. if we answer it on the show,

we'll send you a little surprise as a thank you. i come on. just ask a question and you can find more sign stories on our website and on twitter. that's all for this week on to morrow today. thanks for watching and join us again next week. until then stay curious. with ah, with

hey ah, with yes compose edition. ha ha ha adults. hitler's obsession. ah,

has ever been better background music for megalomania? gross vaughan arts 2190 minutes on d. w. sometimes a seed is all you need to allow big ideas to grow. we're bringing environmental conservation to life with learning packs like global ideas. we will show you how climate change and environmental conservation is taking shape around the world and how we can all make a difference. knowledge grows through sharing, download it now for free india, a land of contrast of ambitions of inequality.

75 years ago, mahatma gandhi peacefully led the country to independence. provide deals with what is remained of his vision with what's the status of human rights and social justice in what's called the world's largest democracy. ah, where is your head? it is the moment unleash on violet pass. and re imagine that these teachings or elements to us. ah, gandhi's legacy starts august 6th on dw ah

ah, this is dw news alive from berlin. ukraine resumes grange shipments to the world's cargo vessels set off across the black sea. after turkey declares it's safe to sail . they're the 1st to export ukrainian grain by sea since the start of russia's war . also coming up on the show.