The human eye is an amazing mechanism, able to detect anywhere from a few photons to a few quadrillion, or switch focus from the screen in front of you to the distant horizon in a third of a second. How did these complex structures...

Thirty primary sources-historical documents, literary texts, and visual images-that explore motivations, visions, patterns, goals, challenges, and relationships with indigenous peoples offered by Europeans in their settlement of the New...

Echolocation is the ability to orient by transmitting sound and receiving echoes from objects in the environment. As a result of a Marco-Polo type activity and subsequent instructional activity, young scholars learn basic concepts of...

Explore this interactive visual to learn the parts of the eye, what the function of each is, and how they work together to give us the ability to see.

Read about President Lyndon Johnson's vision for a more compassionate America, one that offered educational and housing opportunities, protected the envrionment, and cared for the nation's seniors. Find a list of the legislation passed...

Marine biologist Thomas Shirley explains the impact of the Gulf of Mexico oil spill in the short and long term. The total impact is hard to determine at this point of time, however. Shirley gives his best opinion of the damage that...

To human eyes, the world at night is a formless canvas of grey. Many nocturnal animals, on the other hand, experience a rich and varied world, bursting with details, shapes, and colors.Anna Stockl uncovers the science behind night...

The focus of this site is the anatomy of the eye. The site include diagrams and slides showing details at the light microscope and electron microscope level.

This article covers a series of topics related to tiger conservation including history, Save the Tiger Fund, a new vision, the human dimension, symbols of recovery, the challenge, and more.