her parents met at uc berkley in the 1960s and the east bay is where her soul is. let's bring in melissa colorado from berkley. >> reporter: the reaction we've been hearing here in the east bay is overwhelmingly positive, a lot of excitement, a lot of enthusiasm. there was one voter who was disappointed and hoping for a more progressive politician. kamala harris was raised here and a student here at 1,000 oaks element any berkley. you are seeing her in this vibrant mural. we broke the news to folks here in berkley as well as in oakland that kamala harris is joe biden's vp pick, and this was their reaction. kamala harris. >> oh, wow! >> wow! >> i'm okay with that. >> reporter: she's the one. hometown girl kamala harris is joe biden's vp pick, becoming the first woman of color on a major party ticket. voters in oakland and berkley, harris' old stomping grounds reacted to the news this afternoon. >> i'm happy. i was hoping it was her. she's from the community. >> a little bit surprised. i would have expected elizabeth warren. >> reporter: he said he wanted biden to pi

you're a student at uc berkley. can you give me a picture of what you're doing? >> yeah. >> and well, first and foremost, i am a student at uc berkley and i am working on research right now regarding james joyce's ulysees. >> okay. >> beyond that, i write and edit, i do social media for catholic companies and organizations, i speak to youth groups, college centers, i am kind of all over the place. i write ploughing posts for various companies. i advice people how to us instagram and pinterest. >> and you consult on social media with people and you're an excellent writer. it says hi, i am sam. i write, edit and do social media for catholics from san francisco, and you have links to various networks of artists, writers and so on. >> uh-huh. >> and as i look through these, i am discovering a world not known to me, which is young catholics, professionals and writers and marketers and so on the internet is going what they do in the service of the catholic faith. >> yes. >> and you seem to be involved with everyone. >> yes. >> everyone i mentioned you're working for. >

and so, what happens is that we have mathematical modelers at uc berkley that take the hospitalization data. what we know about the population biology of the virus and then do projections. we're much better than two weeks ago. two weeks ago, we were projected to go up to 1,000 cases if we did not get things under control. this is an example where i say we're much better off today than we were back then. back during the first wave, we did not know about the utility of face coverings. now we know about face coverings. we're able to give people concrete advice and that's why we were able to make a difference here. we can see that it's getting much better. next slide. and so, this is what's called the effective reproductive number and that is the average number of secondary cases produced by an infectious case and so an infectious case produces more than one. the epidemic grows and if it produces more than one, the epidemic decreases. this is a positive feedback group and it grows exponentially and when it's below one, it's a negative feedback and so, the epidemic is doing smaller and smal