Magazine content is available exclusively for TIME subscribers.Science: Rio Teodoro
Rio Téodoro
In 1909, as Theodore Roosevelt was moving out of the White House, a Brazilian army engineer named Candido Mariano da Silva Rondon, running a telegraph line through the untracked fastnesses of central Brazil, glimpsed the headwaters of an unmapped river that flowed he knew not whither. He called it Rio da Dúvida—"River of Doubt."
In 1913 Theodore Roosevelt, his thirst for adventure unslaked by a shooting trip in Africa and another unsuccessful crack at the U. S. Presidency, was invited to address a number of learned bodies in Argentina and Brazil....
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