economic engine attracting investments, creating jobs, and, in the end, standing on its own without greg carrcheering] >> since our report first aired, the gorongosa national park has nearly doubled in size and added many new animals. and, yes, that does include zebras. in 2011, the park drew 7,500 visitors, and carr believes that by 2015, that will increase to 15,000. as for the health program, carr says it's going strong. he's decided to provide mobile vans instead of clinics and is partnering with new york's mount sinai hospital to train local women as community health workers. [ticking] coming up: the antinoris, one of the oldest family businesses on earth. >> the first document which we have which proves that an ancestor of mine was involved in the wine production dates back to 1385. >> all in the family, when 60 minutes on cnbc returns. [ticking] choose control. introducing gold choice. the freedom you can only get from hertz to keep the car you reserved or simply choose another. and it's free. ya know, for whoever you are that day. it's just another way you'll be traveling at the speed