"Thanks from keeping me from being a liar," said Nikolai. "What?" "About your having diarrhea." "For you I'd get dysentery." "Now that's friendship."

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As we have taken diarrhea and pneumonia down, even malaria down quite a bit, the portion of the days that are very early in that 5 years - the first month, the first day - it's about half now. Yet that's the part we understand the least.

— Bill Gates