A trip to the Amazon in 1913 almost cost Teddy his life. He set out on an expedition trekking along the largely uncharted “River of Doubt.” (I mean, it’s called the “River of Doubt”…. what could go wrong?) Half of the crew’s pack animals died of exhaustion. They were dangerously low on food. A bunch of them contracted tropical fevers — including Teddy himself, who was prepared to be left to die so as not to slow down the others. After a grueling two months, however, they eventually made it back to civilization.