nolan bushnell, tech pioneer. thank you so much for joining us., a year after the zika virus burst onto the scene, we will take a look at the latest technology being used to fight this terrible disease. ♪ emily: back in september, some south american countries began reporting a sharp increase in the number of cases of microcephaly, a condition in which babies are born with abnormally small heads. before long, the zika virus was named. the disease rages on with cases being reported in over 50 countries. how can we prevent the further spread of the virus through technology? a startup uses computer modeling to prevent further breakouts. joining me is nathan wolfe, with a long background in epidemiology. it's been a year since the first case was reported in the americas. it doesn't seem that we are close to a vaccine, cure, or real treatment here. i mean, isn't that astounding to you? nathan: it's interesting. if you actually think about it, in the last three years, we have witnessed tremendous epidemics. a year ago, it would have been ebola. the year

emily: atari cofounder nolan bushnell.he was an early investor in some of tech's biggest unicorns. our exclusive interview which arterarter -- with troy c is up next. emily: investors are continuing their caution towards tech. specifically private valuations with some notable voices point to a few early signs of a bubble. i spoke with troy carter, founder and ceo of atom factory. the firm was an early investor in some of tech's biggest unicorns including uber and spotify. i asked if winter really is coming for the industry. troy: we are starting to see market corrections both on the late stage and in the early stage side as well. we do feel -- i think we are starting to see a lot of the younger entrepreneurs get a lot smarter in terms of their business approach. before where it was about how can -- it was all about hypergrowth, i think a lot of entrepreneurs are factoring in droplet ability of revenue and things like that as well. we are starting to see a correction in behavior. emily: you are an investor in uber, lyft and

thank you, nolan bushnell. >> thank you.e hair. >> the eighties airs tomorrow night at 9:00 right here on cnn. we will be right back. . . . >>> before we leave you tonight, in the last moments, may the fourth be with you. here's something you've got to see. >> my favorite song. how did you know? >> come on, stormtrooper. come on. ♪ got to kiss myself so pretty ♪ >> uptown funk, baby. >> the white house posting this video of president obama and first lady michelle obama of the "star wars" dance party in december. that's it for me tonight. "early start" with christine romans and john berman begins now. >>> the last man standing. donald trump on the campaign trail as the only republican left in the race for president. speaking to cnn about the general election fight in front of him. >>> hillary clinton taking aim at donald trump speaking with cnn about the presumptive republican nominee and the democratic primary challenger she still can't shake. good morning. welcome to "early start." i'm john berman. >> i'm christine romans.