in birmingham england and they've come up with all kinds of bizarre ideas we joined cake on as ben callan at the fair and watched him create something very special. wanna thank all the otherwise known as the biking. and his world is that of cake artist every year the best from around the world meet at the cake international in birmingham england. this year some 1300 bakers professionals and amateurs are here to present their creations. some of these artworks it's hard to tell but they are in fact cakes. such as is life size effigy of a character from the t.v. series killing eve. my favorite thing for me is seeing so incredible. i can ideas you know come in and. basically realizing in the in the industry your level how you can improve things you can do things that other people do that just really give you stronger ideas. than colin's own entry as a chimpanzee lifesize at one metre high in 80 kilos but this one is edible then put 4 days of work into it but. the biggest challenge doing this was actually trying to get the stunts how they see it is so sort of strange then i thought when i star

i'm joined by professor ben cowling at the university of hong kong his research there focuses on respiratory virus transmission and the impact of control measures on professor callan he's also a co-director of the w. h. o. collaborating center for infectious disease epidemiology and control at the h k you school of public health good to have you with us so please there are still a lot of mosque critics out there and they say that there's simply not enough evidence that wearing masks could actually stop or at least reduce the spread of the virus you however were involved in a study that was published just last week tell us a bit about that. sure so the study that we did last week was a very careful experimental study in a lower tree of how much virus comes out of the mouths of people with influenza or common cold infections including common cold run a virus and we found a lot of virus in the x. outbreath not only in the large structures but also in the small particle aerosols and the 2nd part of the study we looked at how well facemask blocked that virus from getting into the environment we captured all of the exhaled breath that these patients were breathing now a