our medical correspondent fergus walsh explains. the brain is the most memplex organ in the body. it was always asit gets irreversibly damaged within minutes of blood flow stopping. now a remarkablstudy in the urnal "nature" challenges that view. the scientists at the yale school of medinesed brains from farm animals. in all,2 brains were collected from an abattoir. dfour hours aftth, the organs were placed in specially designed tanks and synthetic blood was pumped at body temperature forix hours. remarkably, despite being dead for hours, cells inside the brain started to function. there was activity in synapses some cells started to work. the brain was using oxygen and blood flow was restored. this video shows some of the blood vessels of the partially revived organ. but there was no whole-brain that might signal awareness. >> this indicates that individual neurons are viable but not capable of forming an organized global activity. this is not a living, functioning brain. fergus: when the brains were tested, there was no global elec

fergus walsh, bbc news. can you imagine feeding 600 bats every day?o protect the species from exteme heat. numbers were hit badly last year when a heatwave in north queensland wiped out almost a third of their population in two days. experts are especially concerned for the spectactled flying foxes — which are only found in a remote rainforest region of north queensland. for more we are joined by rebecca koller and one of her beloved bats, sparrow, on webcam from kuranda, queensland. thank you forjoining us. and you show us your beloved sparrow. he is so show us your beloved sparrow. he is so cute. she, she is three months old. how she become? she will grow to double the size when she is six months old. then she will be almost full grown. at that point she will be able to go back to the wild. and her wingspan, look at that. just spread her wings. we can see her wings. they are quite large just for three months old. sparrow is one of 600 that's under your care. how do you manage to look after all of them? it's a lot of hours, very very early mornings a

fergus walsh, bbc news.ave been protesting in central london. demonstrators have spent the day camped at majorjunctions in london including oxford circus and waterloo bridge. so far 340 people have been arrested. our home affairs correspondent tom symonds reports. this is normally one of the busiest bridges across the thames. extinction rebellion, a new direct action protest group, hoped to take control of this and other key london locations for up to two weeks. using powers designed to balance the rights of protest with the need to reduce disruption. the police are taking this extremely slowly, not least to keep the temperature under control, but also because they're starting to run out of police cells. i'm here because humanity is facing extinction and ecocide. i'm here as a peaceful protester, the government must take action. their demands? the declaration of a climate emergency, radical cuts to carbon emissions. "we're sorry for the disruption," they say. the fact of the matter is that we have tried thin

fergus walsh, bbc news.security prison, according to members of his family. months of protests against deteriorating conditions in the country culminated in him being deposed in an army coup last week. and protesters are now calling for theirformer leaders to be held to account for their crimes, as our africa correspondent alistair leithead reports from the capital, khartoum. change has already come to sudan, but you wouldn't have thought so on the streets of khartoum today. in a place where dissent is dealt with through intimidation and torture, these people risked it all to stand their ground and now say they won't stop until they get what they want. and there's a long list of demands. all three of these protesters were picked up from home by the security forces at night and held for months in terrible conditions. abdullah isjust 21, an it student — he described being forced into stress positions all night and being tortured with an electric stick. he saw a lot of other young people beaten many times. moru

raise ethical questions about what it means to be alive and conscious. 0ur medical correspondent fergus walsh complex organ in the body. it was always assumed it gets irreversibly damaged within minutes of blood flow stopping. now, a remarkable study in the journal nature challenges that view. the scientists at yale school of medicine used brains from farm animals bred for pork. in all, 32 brains were collected from an abbatoir. four hours after death, the organs were placed in specially designed tanks and synthetic blood was pumped round at body temperature for six hours. remarkably, despite being dead for hours, cells within the brain started to function. there was activity in synapses. some brain circuits started to work. the brains began to use energy and oxygen, and blood flow was restored. this video shows some of the blood vessels of the partially revived organs. but there was no whole brain activity that might signal awareness. what this indicates is individual neurones are viable, but are not capable of forming an organised global activity, this is not a functioning brain, but a cell