Do grizzly bears belong in Washington state?

Army Corps of Engineers clears way for Dakota Access Pipeline

12 of the most inspirational female adventurers

Scientists finally explain mysterious 'fairy circles' found in Namibia

10 women who changed the way we see nature

Americans are quietly preserving 56 million acres of private land

What makes a champion tree?

The Earth's mountains, rocks and water bodies are ancient. Do you know how old they are?

World's highest plants discovered 20,000 feet above sea level

Africa's tallest tree discovered towering on continent's highest mountain

11 facts about North America's temperate rain forests

9 trailblazing female explorers