beautiful landscape is a this bike tour. it is for congress checking in 30 minutes on d. w. as you go to use it for thought they will, grey, you will they rule the skies. there are about 50000000000 bags around the world. nowadays they are the only animals with feathers about 300000000 years ago. the family, 3 of birds and mammals separated and their brains developed differently. so

it was long thought that birds were less intelligent than mammals. but they really are more clever than we thought that and more on tomorrow to day d w. sign show these magpies can dispose of bottle caps better than some humans for every kept very warded with the treat. as you can see, they're pretty clever. unless despite the fact that bad brains don't have a cerebral cortex, the so called neocortex. the set of layers of the mammalian brain that controls higher mental performance despite their birth display, amazing cognitive abilities. what's the explanation for the researchers out rule university bolcom are looking for

answers. the scientists here work with ravens. so as yet this is athena. i'm taking her for her daily training and that i lean cloud works with athena. are you region cro, a song bird from the raven family? ravens are thought to be especially intelligent. and then. but athena is rather shy . it's better if we keep our distance. strange people are objects like our camera can distract the bird. he attends right here. look in a one very good there athena, another one, a member of the kind of unknown faces me. it's ok cancel. just like always, honestly alive. she brings athena into the testing area. here the

bird will pick up a monitor with its beak memorizing specific patterns and sequences in the process. as long as we can, we can watch athena from above other the other that she's working now the most on do you think she's to pack the point on these 3 monitors, a pick a black point to pass and she must walk over and respond. athena must also memorize the sequence in which she picks the point so that she can enter the exact same pattern into a 4th monitor. besides that, if i so she got that raleigh, let's see. the monitors briefly turned black to signal that you have it. let's see if she gets it right this time, mccorkle up to set this dismal each location corresponds to an abstract symbol which doesn't appear there. the monitor above stands for camping. the monitor on the right stands for toilet and left is port. a black point is the only thing shown

on the screen. athena must confirm the sequences on the control monitor using the correct symbols, camping toilet port. she got it right here once again because it went so fast camping toilet port and her reward. so by see if, if she elses correctly, she gets feed. what? um the foot feet pallets come out this automatic dispenser altogether than the next task against which i lost a little is known about how birds brings function or neuroscience just yona salsa and his team. hope such experiments will help them figure out how ravens retrieve info from short term memory, which could be a key to understanding birds intelligence. this is against this to his team, but it's an important system. as it forms the foundation of degrees of higher

cognition and its characteristics make it attractive to study its capacity is limited and we can't recall endless numbers of things and it's fragile. info gets lost when we're distracted in philosophy. follow on. this gives us the chance to see how it performs compared to other species. and this is how good is a crow compared to a monkey? for example, hands i lies. how much can they recall here? how flexibly can they work with these kinds of subjects again, on to bombay. in this experiment, a crow is learning that only the tube on the right will help it raise the water level in the middle and bring the food closer. when it throws in stones on the left and nothing happens, ah, the amazing thing, it's learning from experience alone and even employing tools that points to complex thought patterns or

besides ravens, owls and parents are also of interest to brain researchers, even pigeons, weight pigeons. of course says bio psychologist, own or going to tune one of the world's foremost pigeon researchers. he also works in both of them and has been examining the birds cognitive abilities for years is marked as a teal as he up isn't. i really like these animals does it and they're not the superstars of learning. that's the crows and parents are. but they have something really great, a kind of meticulous persistence in carrying out a given task like men, should they work on it for hours and that's ideal for scientists as the mistakes they, mike provide incredible insight into how the thought process functions. ve distinct from tenure, vacuuming. that's why they great research animals. hampton is i love them. he busy i. in mammals,

the brains cortex is responsible for complex problem solving. it was assumed birds lacked such a cortex. but with the help of a laser, scientists have found cortex like structures visible in the cross section of a bird's brain. the typical horizontal and vertical strands that make complex thought possible. you believe that the kinds the vertical strands enable an extremely detailed analysis of everything they perceive the horizontal helped them connected altogether. as me done under a microscope, it becomes clear with the vertical and horizontal structures are capable of. but isn't it ice in it? what we see are individual dark and nerve cells with the technology we've applied here. we can see when the darkened cells communicate with other nerve cells and of and so in a way we're seeing who's communicating with whom he did to me to him. it's an astonishing discovery. no one expected a birds brain could be as complex as

a mammals didn't instantly. at 1st glance, the brain seems so different and you'd be at the further in you go and the more carefully you look, the more you find the same basic principles. the closer you look in, the more similar they are, levine, shown. in other words, brain structure is a decisive factor in determining an animal's cognitive buildings ah, bets are relatives of dinosaurs. and in fact, a unique find of a fossilized dinosaurs brain shows that some dinosaurs had brains very similar to crocodiles and bags. the primeval bird, ocoee of tricks, is considered the link between dinosaurs and primeval, but it already had a larger brain for its body size, which probably allowed it to fly so bare so actually,

descendants from dinosaurs. but are they still some species that live during the era of dinosaurs? our view a david burgers from columbia sent us the following question. are animal species present today that survived the age of the dinosaurs? some 66000000 years ago of 14 kilometer wide asteroids slammed into the earth, triggering a mass extinction. within seconds, the space rock vaporized across the earth. fires raged, and volcanoes erupted. within a few days, the earth was blanketed in darkness. the deadly ice age that followed lasted for years. acid rain transformed the ocean's vegetation died. 3 quarters of all

species were white doubt. today's reptiles may resemble many dinosaurs, but in most cases they have little in common with their forebears. unlike crocodiles, a prehistoric relative of the crocodile emerged 250000000 years ago. and crocodiles are ultimate survivors. they eat almost anything and can go for long periods without food. turtles are also one of the oldest living reptile groups. the earliest known turtles swam the world's oceans 225000000 years ago and looked remarkably similar to those solitary, ancient creatures that exists to day. sting rays have roamed the oceans for even longer. these primordial creatures belong to the cartilage in his fish, family and stew sharks. they were already among the top predators of the oceans in the age of the dinosaurs, the catastrophic consequences of the asteroid had little impact on shark biodiversity. horseshoe crabs haven't changed much in

150000000 years. that's because these living fossils can survive in water of varying salting. us and warmth. birds evolved from a group of dinosaurs that survived thanks to their feathers. chickens and ostriches, are the closest living relatives up to run a sonorous racks. sounds improbable. just compare how they walk. ah, even inside their eggs, the dani souls behaved similar to today's birds. this is suggested by the fossilized egg of an ovo rapturous source in this compute animation. the embryos cold up called a tucking posture, which was previously known only to birds. in fact, many dinosaurs had down feathers not full flying, but to keep him warm and to charm of the dinosaurs. even the tie ran his sorres'

rex is believed to have hat down feathers. unfortunately, only traces of the plumage have been preserved. much of what we know about dinosaurs comes from analyzing their bones. they show who lived here more than 66000000 years ago. special delivery from the us sent by a wealthy collector. the contents of this crate are technically worth several 1000000 euros. but actually they're priceless rail fossilized bones of a dinosaur. king the toronto source rex. it would have 100 it's prey in what is now north america. we have folk and his team will try to reassemble the complete skeleton as get out on the side is assume we want to restore this beautiful animal to its former glory. it's 66000000 years old. we need to rebuild the dinosaur according to how we think it would have moved. it's fascinating to handle an

original skeleton and tend to think of all the places where it's said it's for him . and if what a bit it's teeth and to why, what it 8 and haunted as and good this angus take for saturday for us and you had like a yard. oh the dinosaur museum. i've moved time in se germany boasts numerous fossil exhibits and treats them for preservation. the star of the show is a chill ran a source, wrecks the only such juvenile skeleton in the world. it's a good 9 meters long, and it's 3 meters high. it to is 66000000 years old. experts believe this animal could eat up to 400 kilos of meat in one go. but exactly which bones are in the delivery. the scientists 1st taken inventory, it's rare to get anything more than a few bones or bone fragments of any given animal. frederick sprinkler uses the museums, juvenile dinosaur, to determine what belongs where a rib, for example,

is one meter 20 long. such long bones are easy to locate, but smaller fragments have to be studied closely just to see which way round they go. he see, i'm canada. i can see which side of the bone faces outwards and which inwards the outside is smooth. it may even be shiny, while this sponge like surface, with lots of holes faces inwards. how's the transition? i mean, how thick is the shell facing outside around the edge? it's just one or 2 millimeters thick, so it could be a vertebra. and that's how i get an idea for where the fragment could belong. cons income. 3 months later, another crate from the u. s. another skeleton, but this time it's a plastic mold of a different t rex. now the scientists can replace the missing pieces and they're dinosaurs skeleton with plastic replicas. their inventory showed they have over 20 percent of the original skeleton. that's actually not bad compared to other similar fines.

all of the original fossils, even the smallest fragments will be used. frederick bin blood locates the right place and the plastic bones then cuts out the exact size hole and sticks the original fragment. to the plastic section, the team needs more than 9 weeks to complete this task. the larger sections are more complicated. here part of the pelvis is made of plastic, while the section being placed on top is an original fossil wing 20 kilos. excel from passes in the bone doesn't completely match the plastic section. so we have to see how we can position at best. there are always inconsistencies. i'm typing. you never get a 100 percent match from a. we make a plan of what we need to correct later so that we can align all the elements to find their best positions. we spent best deposits of infants. they use polyester

resin to attach the sections. it's a very powerful adhesive that works well, both on stone and plastic that's essential, given the weight of the stone sections. yeah, this is good. a few weeks later, a local metal working company is brought in on the project. the family business normally produces steps and balcony railings, as if this is the 1st time father and son have had a dyno in their workshop. my numbers on those now for something completely different. most people realty thing you have to be a little creative, hampton, yet the sham up with an idea, the movie, the more. but then it works on la raphael, young the you have to be a bit courageous to take on a job like this. prolonged so name, they're working on a precise metal structure that will provide the framework. while clips and iron pipes hold the bones in place. but getting everything in exactly the right position

takes a lot of patience. dismiss, no, that'll need correcting status. a section 5 needs to come a bit forward. the dinosaurs starting to take shape. this specimen was over 11 meters in length o. be shy of fargo also pays regular visits to the metal workshop. after 6 weeks, the time has finally come to add the head. putting it together was more complicated than expected. oh, this house is on and it took longer than planned as things always come up. but you go the extra mile to make sure you achieve the high quality that we have here. and the effort has definitely paid off went down oftentimes with the huge ribcage alone is impressive. after millions of years, the tarana source rex is now slowly being restored to its original form

dinosaur bones. and everything else that lived millions of years ago are not covered by earth. it's all part of his so called carbon and cycle plants and entire forests that died and turned into coal. carbon in the form of carbon dioxide circulates to put it simply, it comes from animals and is taken up by plans through photosynthesis. but ever since humans intervened in the cycle, it's been thrown out of balance. coal mining and burning releases more c o 2 than can be stored again. if we can, so plants in such a way that their carbon remains in them and doesn't enter the atmosphere. it could not only help the climate this is by o chance. some 20 tons of ether mixed with bio guzman. you're in this poll to optimize the fertilizer. next to it is another pool of bio gas fat. eliza without

bio chon. there's a difference in color between the 2 slurries. the left speaker contains bio chon, the right one, doesn't the contents of both pools to be tested on the field and monitored by scientists. this project was initiated by soil scientist, macos stephens under mr. bernard coffin. their goal is to optimize the potential of bio china in agriculture because people expect great things from this charcoal. the hoffman is the famous them. the hope is that we can use bio charts achieve stable yields, especially during dry spells that i saw have greenfields and good yields, even during times of drought attack else than as well as performing another task for agriculture belt, storing carbon in the soil who called and stuffing bolton,

that's because each tone of bio charmin you will mixture compensates for $2.00 tons of c o. 2. with climate change, accelerating solutions for sequestering carbon are sorely needed. whether an agriculture, animal feed, or plant breeding. the use of bio chaw is boomerang. oh, producing high quality bio char requires a special process called pyrolysis. the controlled thermal decomposition of bio mass. the process starts with would leaves branches or cut grass after they've been finely chopped. they land in the pyro electric oven here, that heated sometimes for hours to as much as $800.00 degrees celsius. since no oxygen is present, the wood chips, char roth, of them bon, said the carbon is fixed in the wood. shit that would later been or rot,

the carbon would be released during the chary harmful ph gases are produced, that burned in a 2nd chamber otherwise the bio child would absorb these toxic gases during the colonization process. such high quality bio child can also be used to breathe and grow plants at this nursery. each sack of potting compassed is enriched with 10 percent charcoal. though he was skeptical at 1st production manager. pascall office is now a fan of bio chow damita spot, and it saves us water. the color, the charcoal stores the water engine, adrian lashed off, so they don't get washed away. north obligate washing. charcoal is also effective against fungal diseases. zoe, save on fungicide on kate dammit,

and insidious side to folded. we have far fewer insect 2 tickets the harbor. now fin vinegar, for example. we hardly are any more dark winged fungus, nat i, wendy, for. i don't know why that is, but we've noticed in always sneaked vices. nish arbor the american thus not only do they use a 3rd less water and less passed aside. the bio char also has a noticeable effect on the seedlings development. the harbor 9 best of her aunt that gives you the root formation is better and healthier and what and when the root formation is good than degrees on the whole plant does better. these shoots are 3 weeks old to stick and we can see that the root formation is already quite good. the roots are very healthy on long and wise fit as a fiddle,

grizzled. the plants grow faster to. this saves the nursery 2 to 3 weeks of cultivation time, letting them produce more seedlings. all these advantages are due to fire charles unique characteristics. top quality bio channel has a very porous structure and therefore huge amount of surface area. a single graham can boast a surface area of up to 300 square meters. this allows by a child to function like a sponge and absorb up to 5 times its own weight in water, as well as the nutrients dissolved in it. these abilities have been proven to better the soil quality the benefits of bio child were confirmed in a recent study. it showed that on average by chance had a positive effect, ensuring more water storage and better provision of nutrients, as well as reducing greenhouse gas emissions. there's just one problem. almost all

the findings are based on experiments conducted in labs and in pots. so this is where soil scientist, mawkish stephens, as long time trial comes in. over a 7 year period, he'll spread $42.00 tons of bio chaw over 6. hacked has a field the results should help scientists provide clear recommendations for farmers on the random experiment. what's special about this experiment is we apply large amounts of charcoal, so we can measure this effect. in addition to practical field terms of on node it follows normal farming practices with tractors carrying normal loads and amounts of manure by harvest. and processing is typically 2 would off to push ground through the bob. i've only one farmers know how to get the maximum benefit from bio char will many be willing to use it as the cost is high. around $1300.00 per ton, even if they're increasingly environmentally conscious farming is still

a business. a company that soon is still it's one of the few sensible measures because the charcoal stays in the ground. god is wendy of proof, that charcoal remains stable in the soil and it doesn't break down. so the amount of carbon you apply to the soil should be the amount that remains, the records applied to higher. oh, that's a big advantage. over of the carbon sinks like forests, the human in soil and marshlands, where fires, ploughing or drainage could cause the carbon to be released again by a char alone won't save the climate. not enough of it can be produced or spread to do that. but there's a lot of potential and bio chon, not using it would be a wasted opportunity for agriculture and the climate if our blood is red, why are they boy with do you also have a science question?

send it in by a video text or voice message. if we answer it on the show, you'll get a little surprise from us as a thank you. go on just off for more from the world of signs, visit our website or twitter. that's it for now. join us again next week for another glimpse into the world of science on a new episode of tomorrow to day. until then take care and stay curious. bye bye. ah, ah, with

a bicycle and one. today i want to find out why the mozilla is one of the most beautiful river states in germany. so i'm off for right along a part of the psychopath. the beautiful landscape is certainly confirmed here.

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we show what it could look like. return to normal. and we visit those who are finding it difficult to success in our weekly coven 19 special. every thursday on d. w. a or eternal and dynamite. and the pillar of sticks and society. a symbol of arbitrary rule. in the struggle for justice. taxes in many ways i think taxation is one of the most extreme actions by a government. but it's also the definition of government because without no government, the right to levy taxes and the obligation to pay them both inherent in the sovereignty of nation states and their citizens. but what happens when the power of

taxation is undermined? a tax on top of the tax on top of the tax. that's the straw that broke the camel's back. i've been renting forever. thinking to myself here. when's it all going to come crashing down? take on stuff you pay won't pay. taxation and politics starts october 21st on d, w. ah, this is dw news, and these are our top stories. officials in iran say, for inmates are dead after a night of clashes at every in prison in tehran. the victims allegedly died of smoke inhalation during a fire. dozens are said to be injured.