The most dangerous worldview is the worldview of those who have not viewed the world.
- Alexander von Humboldt
From being the first to fly around the globe in a balloon, to his Solar Impulse project, Prof.
The vaquita—a species of porpoise only found in the Northern Gulf of California—is in serious trouble.
Ueli Steck, who died in Nepal on April 30, was probably this generation’s greatest alpinist.