stefan because team divides the test subjects into groups according to the subjects polly janick scores and then they observe how the group with the especially high schizophrenia scores develops the researchers are a long way off from totally understanding the complex genetics of psychiatric diseases but they are making progress. why. in a moment we'll be taking a look at me well us but even as we're pretty impressive small but mighty well not all that we can reach out like that 135 centimeters and why up to 36 kilos. last hour ferguson usually think you have up to $600.00 hairs per square centimeter of skin we have up to $23000.00 to top that. chafe other stuff of legends. we use them to build gigantic structures like this a dam 850 meters long so big it's visible from outer space no wonder you call is busy. we might be rodents but we're also ecosystem engineers geniuses though not all humans agree. most people tend to think of beavers as a nuisance as pasts but it turns out that beavers are very beneficial to the ecosystem. here in the easy river valley of southern germany water buffa