The webpage for National Geographic--containing articles and images on animals, the environment, travel, adventure and much more!

This interactive periodic table lets you find information on any of the 118 elements, the chemistry behind them and a whole lot of other science-related stuff.

Providing global access to information about life on earth.

Produced by US Central Intelligence Agency, the World FactBook contains a wealth of up-to-date information on all the countries of the world.

Founded for the "increase and diffuciton of knowledge", the Smithsonian Institution's website contains a wealth of articles, collections, exhibits and even an encyclopedia.