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Lot of pots and perhaps this is not one he can trust and elon musk responded by saying interesting. then another twitter user suggested a new policy change for twitter and elon musk said that idea was a good point and that it would become twitter policy so he is still clearly the boss, he is still clearly the boss, he is still running things at twitter hq and he said so himself, he hasn't actually appointed a successor yet and of course the last seven weeks have been impossible to predict and they have been extremely chaotic. hi spoke to a tesla and twitter investor, tesla of course is elon mu...

We could power entire cities with this at some point? >> yeah, yeah. listen, once we get to the generator stage, that's it for fossil fuels. once we can generate an energy, we will have all the energy we need and more that is absolutely, you know, no pollution and completely sustainable. so to get there now is really an engineering problem. it will take a considerable amount of work. we proved you can do it. now doing it in a way that you can generate -- you can build a generating station and use this, there's an enormous amount of engineering to get there, and a lot of scientific problems to ...

That rapid test will be given to everyone, including nursing home staff and workers in pre schools. michael mina is a professor at harvard school of public health. he has been begging this drum for a month. he wrote, a goal of rapid testing is to keep nine out of ten infectious people from walking into a train station and infecting others. this is an engineering problem, not medicine. he joins me now. michael mina, let's start on the accuracy of these tests, because i think back last year they got a bad rap. people generally felt like, oh, they are not reliable, they get false positives. my un...

Accounting guy, a business guy. maybe it's time to put engineers at the top. >> mary, you were the ig far long time. is this also in addition to an engineering problem a regulation problem? >> yes, it is. it's a huge regulation problem. because federal aviation regulations among other things say the plane has to be aerodynamically stable and this is not without the mcas system in boeing's words. of course they're tweaking it but that isn't going to help this. and you have another problem in federal aviation regulations requiring a redundancy. you cannot have a system that takes data from only ...

Say the least. and the company has to gain the confidence of the pilots themselves before they hand out these cards explaining the apparent safety of the 737 max. i think it's -- the cart is a little bit before the horse here for boeing. they need to address some much more fundamental issues before they start thinking about pr. >> mary, you know, they have been really doing polls and focus groups to see if people would be willing to fly on these airlines. and the numbers aren't gotten considerably better over the last several months. is this the right strategy to put the facts as they see it f...