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 to be very aerodynamic. but this to make of clapping and cupping now appears to have given them an evolutionary advantage. thinking is this technique developed by the humble butterfly could be applied to modern tech allergy to make drones and underwater vehicles faster, travel further and last for longer. laura foster, bbc news. just a reminder that later today in washington, it will be the inauguration, handover of powerfrom president biden. the time now in washington, just after half past midnight. we are in the final 12 hours of the trump presidency. a changeover at 12 noon exactly local time. changeover at 12 noon exactly localtime. 0f changeover at 12 noon exactly local time. of course, very different inauguration one we have ever seen or be extensive
it was this moment that has left scientists all aflutter. i speed cameras confirming what had been suspected for half a century, that butterflies don t just flap their win wings but clap them together. there are taxable wings bending to form a cup pocket about. when they collapse, this trust is even stronger and more efficient. it s only now thanks to modern technology and a swedish wind tunnel that we can see it. , . swedish wind tunnel that we can see it. v .. . swedish wind tunnel that we can see it. , ., . ., ., see it. it s a challenge to work with see it. it s a challenge to work with any see it. it s a challenge to work with any living - 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 whe
25,000 troops will line streets for the inauguration later but the traditional crowds will be absent. and if you want to get in touch about the inauguration what it means for the united states and the rest of the world or indeed any of our other stories, you can contact me on @annita mcveigh or #bbcyourquestions. the former prime minister theresa may accuses boris johnson of abandoning britain s position of global moral leadership. the environment agency warns of a volatile situation as parts of northern england prepare for torrential rainfall from storm christoph. some of the uk s biggest music stars accuse the government of failing the country s performers over the brexit deal. could freelancers finally be brought in to government support schemes such as furlough? the covid tax system faces heavy criticism, with mps demanding government
to be very aerodynamic. but this to make of clapping and cupping now appears to have given them an evolutionary advantage. the thinking is this technique developed by the humble butterfly could be applied to modern technology to make drones and underwater vehicles faster, travel further and last for longer. laura foster, bbc news. let s see that live shot of the white house again. 25,000 troops for the inauguration and a huge security operation. because of covid 19, the traditional acts will be absent. jae because of covid-19, the traditional acts will be absent. acts will be absent. joe biden will be stopping acts will be absent. joe biden will be stopping the acts will be absent. joe biden will be stopping the construction - acts will be absent. joe biden will be stopping the construction of i acts will be absent. joe biden will. be stopping the construction of the mexico border wall which was a key
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