is a specialist on digital epidemiology at the swiss federal institute of technology the e.p.a. f l and he joins us now good to have you with us you just attended i believe a press conference on the new swiss proximity tracing app which was co-developed by the e.p.a. f l how is the up going to slow the spread of sasco to. well we're less interested i guess and slowing the spread we really want to sort of prevent another way from happening i think that's where the apps will shine the most because they will support the consecration which is so important to break the transmission chains but that hasn't happened with with all the apps already existing we certainly know that the australian covert $1000.00 app only found one k's in a month do we know what the problem is. well so one has to be seen that before today it was essential impossible to really build a contact tracing app that would work on all sean so all the apps that have been released before today have had these severe issues that they didn't work properly especially on i phones because the operating system just wouldn't a

london are spent years researching cement free building materials at the swiss federal institute of technology in zurich cement is responsible for 8 percent of worldwide carbon emissions a more sustainable building material is long overdue lundell founded on construction sites where every year millions of tons of clay based excavation materials are disposed of but when they're mixed with a naturally occurring mineral and water they result in a construction material that's more environmentally friendly than standard concrete with a cement free of concrete is up to 90 percent. c o 2 reduction done compared to conventional concrete and there are advantages that we'd all. like primary role much to have come from a place in the crowd from inside and. in some areas in the war but we use construction waste linfield most of the time and. they are much as cheap to access therefore like and reduce the price of the confession material. this earth concrete can be processed more or less like standard concrete but it currently around half the cost. yeah the landreau was inspired by building practices in his

next let's hear from professor carmela tron—coso from the swiss federal institute of technology, she'se already been in contact with a person that has been diagnosed positive. so this app has a very social operation. it says what i can do at that point is protect others and others include those 70 plus people that we are talking about. so it is if they receive 80% of the people that are supposed to have install the app and have smartphone use it and actually obey then the rest of the population is protected because eventually we will not have asymptomatic people walking around that can infect others. technology was always going to be part of the response to this virus — but for it to work, it will need a lot of people, a lot of you — to willingly take part. governments now wait to see if people are willing to take the asssurancees about their data and download the app. a leap of faith for many. thanks very much for that. thanks very much for that. so lets examine what's been going on in tanzania and its response to the pandemic. president magufuli has not imposed a lockdown, and the go