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Mark lobel, bbc news. the sight of a butterfly taking flight is something lots of us have stopped to look at, but have you ever wondered how such delicate creatures fly? a new study has found butterflies cup and clap their wings to generate thrust which helps them avoid dangerous predators. scientists in sweden used a wind tunnel and high speed cameras to capture the insect s unique flying skill. a p pa re ntly apparently the material is flexible and it forms a pocket of air which claps together which propels even better, so the practical, what is the word i am looking for? i don t know. application the word i am looking for? i don t know. application of the word i am looking for? i don t know. application of that - the word i am looking for? i don t know. application of that is - the word i am looking for? i don t know. application of that is the i the word i am looking for? i don t l know. application of that is the way that drones know. application of that is the way that dron ....
What had been suspected for half a century, that butterflies don t just flap their wings, but clap them together. theirflexible wings bending to form a cup, or a pocket, of air. when they collapse, this thrust is even stronger and more efficient. it s only now thanks to modern technology and a swedish wind tunnel that we can see it. it s a challenge to work with any living flying animal but with butterflies it s maybe even more because they are smaller, they are fast in their behaviour, difficult to predict their behaviour and also when flying them in a wind tunnel, it s difficult to get them to behave as you want to, when you want to and also to fly where you want them to fly. for a long time, scientists wondered how these creatures could actually avoid predators because of their awkward shape. if you look at their wings, you can see they are very large and broad compared to the size of their body and aren t considered ....
A new insight into one of the mysteries of the natural world, how butterflies fly despite being equipped with large, inefficient wings. they ve discovered that butterflies cup their wings when taking off. this forms an air pocket that pushes the insect forward at speed, helping it to escape predators. researchers believe the knowledge could prove useful in other spheres, such as making some drones and underwater vehicles more efficient. this is bbc world news, the latest headlines: joe biden and kamala harris lead a ceremony to honour the 400,000 americans who ve died during the pandemic. president trump releases a farewell video on his last day in office before issuing his presidential pardons, including one for key former aide steve bannon. netflix got a big boost from the pandemic last year, as demand for streaming movies and television soared. the company now has more than 200 million paid members, up more than 30% from 2019. about 37 million people subscribed last year, including ....
Have a label, is the case for the atrocities being committed against the uighur people in china by the communist party. stay with us on bbc news, still to come: the puzzle of how butterflies fly has been solved and the answer could propel human travel. donald trump is now the 45th president of the united states. he was sworn in before several hundred thousand people on the steps of capitol hill in washington. it s going to be only america first. america first. demonstrators waiting for mike gatting and his rebel cricket team were attacked with tear gas and set upon by police dogs. anti apartheid campaigners say they will carry on the protests throughout the tour. ....
What the snp want, though, is it? i mean, they voted for a no deal brexit so under their plans, it would have been even harder. and as the music industry themselves have said, what they need now is clarity, not recriminations. and that, mr speaker, is what the british government are working to provide. the culture secretary will be hosting a roundtable discussion with musicians on this matter. i do not know if the six pistols have been invited. and, thank you very much. a new study has helped solve the puzzle of how butterflies take to the air. for decades, scientists thought their large wings were aerodynamically inefficient. but they ve now worked out that butterflies cup their wings when taking off, forming an air pocket that pushes the insect forward helping it to escape predators. laura foster reports. it was this moment that has left scientists all aflutter. high speed cameras confirming ....