then, relocating the bushmen. after being forced out of their homeland, the struggle for the few remaining hunter-gatherers in botswana to preserve their culture. >> officially, nobody is allowed to return. over the years, some have tried to recreate life in the villages, but they say it's just not the same. >> brangham: and, what's the buzz on a new beer? how a lab discovered a new type of yeast from bees, that's changing the game for beer makers. >> we actually think, based on some work from colleagues in italy, that it's very likely that those first beers and breads were relying on yeasts from insects, too. >> brangham: all that and more, on tonight's pbs newshour. >> major funding for the pbs newshour has been provided by: >> bnsf railway. >> and with the ongoing support of these institutions: >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> brangham: it was north korea's own version of fireworks for the