Article, Online Resource
Bessel discovered Sirius' unseen companion star long before technology allowed us to see Sirius B and even longer before quantum mechanics explained the nature of white dwarfs.
From leaf margin and arrangement to the parts of a flower and a corn seedling, take an illustrated look at plant morphology with this collection of guides.
Have you ever wondered what gives chocolate its flavor? Or where olive oil comes from? You might be surprised to learn just how far some of the items in your shopping bag have traveled.
There are 10 divisions in the plant kingdom. The largest order, flowering plants, has 235,000 species. The smallest, gingkoes, has a single species. Learn more about the orders in the kingdom Plantae.
Travel to the lush Dzanga-Sangha rainforest with BaAka. This excellent tour guide will show you the sights—and help you find the clues needed to play Connect the Dots.
Even the busiest of cities are buzzing with biodiversity. Take a virtual stroll through a city park for a close-up look at some of the inhabitants you otherwise might not notice.
Play the Web of Life game to discover how all the players in an ecosystem depend on each other to survive. As you play, you'll come up with the connections between different species and their environments.
If the Earth turns all the way around every 24 hours, then why are some days longer than others? And why do we have winter and summer? See the answers for yourself—in a matter of seconds.
From Pennsylvania to the Pacific Ocean and back again. Experience the final day of an expedition to study deep sea vents with this eyewitness account, and learn what came of the research.