TED】タピワ・チウェ。大きな問題を解決するために専門家である必要はない (You don't have to be an expert to solve a big problems | タピワ・チウェ) (【TED】Tapiwa Chiwewe: You don't have to be an expert to solve big problems (You don't have to be an expert to solve big problems | Tapiwa Chiwewe))