A short walk beneath the dense Amazon canopy, the forest abruptly opens up. Fallen logs are rotting, the trees grow sparser and the temperature rises in places sunlight hits the ground. This is what ...

Giant groundsels are rare plants that grow up to 30 feet (9 meters) tall. They are endemic to the slopes of Mount Kilimanjaro, a dormant volcano in Tanzania and Africa's tallest mountain.

PICKS are stories from many sources, selected by our editors or recommended by our readers because they are important, ...