The Final Adventure of a Pioneer Scientist

The obsessive navigator Josiah Gregg alienated the members of an ill-fated expedition into California’s wilderness.

Josiah Gregg was an obsessive 19th-century math savant, navigator, medical doctor and botanist — and a terrible traveling companion, according to the members of a harrowing expedition he led into the California wilderness. He possessed remarkable talents, but relating to his fellow humans was not one of them. (Visual: )

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BREATHTAKING

Undark is visiting seven locations on five continents to document the impacts of particulate pollution. Explore this special series:

INTRODUCTION
PATNA, INDIA
DHAKA, BANGLADESH
SOUTHERN NIGERIA
SHIJIAZHUANG, CHINA
CENTRAL CALIFORNIA
SANTIAGO & COYHAIQUE, CHILE

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