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!

Buckle up your virtual seatbelts for a trip to the Moon! This guide provides the key educational concepts of this show. After you "land on the Moon," use the suggested activities to continue your lunar exploration.

Buckle up your virtual seatbelts! This guide provides the key educational concepts of the dome show at the Museum's Hayden Planetarium. After you "land on the Moon," use the suggested tours to continue your lunar exploration throughout the Museum.

Take your students on a comprehensive tour of the moon to help them discover careers in science and education with this DVD and its classroom investigations.

Considered the world's most intriguing genius, Einstein has inspired hundreds of writings. Here's a short list of some of the most enlightening looks at his life and ideas, including some he penned.