Getting one's hands dirty at a technical level is incredibly difficult. Bill Gates's training and experience is in computer science and business; to develop the

Getting one's hands dirty at a technical level is incredibly difficult. Bill Gates's training and experience is in computer science and business; to develop the background needed to understand the details of treatment for Malaria, HIV/AIDS, etc would take many many years of intense, focused effort. Someone like Bill Gates could hire someone with the technical expertise while spending his own time on more productive things that are likely to yield more good for the world--networking with other billionaires to convince them to donate money, working to manage the overall structure of the B&M Gates Foundation, etc. Complex systems are complex. 200 years ago, the amount that we knew was significantly smaller; one could get to the edge of human knowledge with just a few years of intense work. In contrast, it takes significantly longer to get to a level of expertise at which one can productively contribute.