Special Feature: 20th Century American Explorers
William Beebe: Going Deeper
An unquenchable curiosity leads this naturalist to explore the wonders and mysteries of the oceans' depths
Lincoln Ellsworth: Pioneering Arctic Aviation
Captivated by the 'gleam of the Northern Lights,' an aviation pioneer explores the Poles by air
John Glenn: The Right Stuff
Coming full circle in the age of space exploration
Robert Peary: To the Top of the World
Battling the elements and controversy while staking his claim to the North Pole
Theodore Roosevelt: Forging the River of Doubt
The unstoppable Bull Moose nearly meets his match in the jungles of Brazil
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