lyndsay, come on, eat some more. we'll get you dressed or you'll be late for school. ago. you don't remember that kitchen, do you? i do — yeah, i do, yeah. she was the very first mum to sign her daughter lyndsay up to the study back in 1991. i didn't really hesitate. i'd always been interested in health and i had an older daughter so i was keen to make sure that the girls were brought up eating well and being in the right kind of environment. i suppose i do worry about what she eats, probably more than anything. and since then, almost everything lyndsay has done has been watched and recorded — feeding into the biggest study ever done into children's health. fantastic, really. and to be the first one... ijust feel really privileged, to be honest, to be a part of it and to be able to help generations to come. may i officially... the professor behind the entire project still carries out research. she's 81. in my wildest dreams, i thought we might follow the children - until they were age seven. the amount of information we've got is world—beating. _ nobody's got anything

prosecutors took that head on and began their case with a pathologyist lyndsay thomas. that it could not be more clear. >> have you formed an opinion on the mechanism of death. >> yes. >> can you tell us what that is? >> in this case, the prime mechanism of death is asphyxia or low oxygen. good -- >> did you rule out -- >> yes, there's no indication that he would have died that night except for the interaction with law enforcement. >> that testimony followed compelling testimony from yesterday, a dr. martin tobin to according to one reporter had the jury on the edge of their seats with his harrowing description of how mr. floyd died. >> mr. floyd died from a low level of oxygen and this caused damage to his brain that we see and it also caused a p.e.a that caused his heart to stop. on the right image, you see his knuckle against the tire. and to most people this does not look like terribly significant. but to a physiologist, it's extraordinarily significant. it tells you that he has used up his resources and now he is literally trying to breathe with his fingers and knu

shear veteran medical examiner lyndsay thomas describing to the jury her observations of what was captured on an officer worn camera. >> overtime, you can see that his breathing is getting more and more difficult. and he is saying less and less. and then, about half way through the whole restraint, subdual compression process, he stops breathing, he first stops speaking entirely. and then, again, shortly that, there's a movement that i believe is what's in, called an inoxic brain reaction. it looks like, kind of a twitch. it's something that the body does when the brain no longer has enough oxygen. so, that's the point at which you can tell by looking, oh, that's where he no longer is getting enough oxygen to his brain. and then, the restraint and subduing and compression continue for many minutes more, even after someone checks and says is, oh, there's no pulse. maintain the position. so at that point, his heart has also stopped. >> have you ever heard such specific and upsetting testimony about a murder victim's excruciating death. it's what has bourn witness to everything that we have s

lyndsay, come on, eat some more. we'll get you dressed or you'll be late for school.rted with 1a,000 pregnant women. 30 years on, their children's children are still being followed. like the cornish family. three generations — linda, laura, alice and evelyn. we first met linda and her daughter laura in the clinic a decade ago. my placenta from when i was born, and now the placentas from when the girls were born are all being stored somewhere. and all the sort of blood and genetic information they've got over the years. it is amazing to think that all that genetic information, all that history of our family is on record somewhere. and it'll be there forever. yeah, absolutely. we've just left a mark on scientific research forever, really, haven't we? it's amazing. we'll do samples of things like our blood and our spit, but we also give away our teeth, as well. they also monitored our fat levels, which wasn't something we always wanted to know, but it was very good and it meant you went away knowing that you had strong bones and maybe you needed to lose a little bit of w