Larger and larger catches of fish may be good for commercial fishing operations, but they're not good for the world. Find out which regions and species are at the greatest risk.

It's not just humans who have jetted to remote regions of the world. For better or worse, international commerce and air travel have helped the global exchange of species and the spread of disease.

Would you believe that the U.S., Europe, the former Soviet Union, and Asia consume more than 85 percent of the world's energy? Take an eye-opening look at consumption.

A Biodiversity Index gives scientists a concrete, uniform way to talk about and compare the biodiversity of different areas. Learn how to calculate this number yourself.

Whether you want a general-purpose field guide or one that focuses on insects native to your corner of the world, you're sure to find the perfect guide in this list of more than 20 titles.

Long and narrow like a feather or small and symmetrical like a rose petal—the variety of oak leaves runs the gamut. See if your leaves match any of the 12 varieties featured in this sheet of hand drawings.

Growing up by the rich lakes and streams of Colorado, I had often noticed dark masses of algae clouding the clear water. The idea that these simple life forms could somehow help power our modern society without the environmental drawbacks of fossil fuels is inherently appealing--a truly green solution.

Investigate the symbolism of gold and other precious metals in South American societies during your visit to the Museum.

Clams that bounce up and down like yo-yos, others that balloon their foot with blood, and squids that zip around using jet propulsion—the ocean's filled with remarkable creatures on the move!