It may be hard to believe that the Earth, with all the complexity and biodiversity we observe today, originated in a cloud of gas and dust. Yet much... ...  more>>

Although we often search social and historical documents for clues to our past, biological “documents” perhaps hold the most important evidence of... ...  more>>

Perhaps the most prominent elements in the patchwork pattern formed by Earth's regions and ecosystems are its deserts, grasslands, and rainforests.... ...  more>>

Even as environmental consciousness and “green” habits become increasingly embedded with numerous individuals, many of the planet’s natural resources  ...  more>>

Drawing crowds for its displays of both raw athleticism and spectacular showmanship, basketball has become one of the most exciting spectator sports... ...  more>>

Even though a growing number of people have begun to consider the impact of their actions on the environment, the planet remains vulnerable to human... ...  more>>

Fathoming the boundlessness of space and the universe, we are immediately filled with curiosity about our own origins and wonder about the objects,... ...  more>>

Described as craggy, rocky, or glacial, among a host of other descriptors, the Earth’s geosphere—that is, its solid foundation—is subject to... ...  more>>

Formalizing study of the natural world may seem like a daunting task considering the sheer breadth and variety of living things that inhabit the... ...  more>>

Distinguished by their highly developed mental faculties and their capacity for reason, humans are often said to reign sovereign in the animal... ...  more>>

The cultural and intellectual achievements of Old World civilizations—ancient Greece or Egypt, for instance—can be glimpsed in present-day societies... ...  more>>

Frequently cited as a land that birthed civilization and culture as we know it, the impact of ancient Greece on the world cannot be overstated. Its... ...  more>>

The human body’s ability to withstand environmental factors and the physical stress of daily life is just as remarkable as its ability to overcome... ...  more>>

Most avid sky gazers wait until nightfall to catch a glimpse of the stars that are scattered across the heavens. The fact of the matter is that one... ...  more>>

Integral to the consciousness of the American people, the sport of baseball has become a steadfast institution in a nation whose identity is... ...  more>>