This expository article, written for students in grades 4-5, explains why ice floats and how this is essential to life on earth. Modified versions are available for younger students.

This easy-to-navigate site has Abraham Lincoln's biography, significant events in his life, an image gallery, and several video clips.

This video segment adapted from NOVA describes the emergence of life on the islands of Hawaii from a barren volcanic platform under the ocean waves to the rich explosion of life that covers the many climate zones of the islands today.

This lesson plan, provided by the International Society for Technology in Education (ISTE), encourages students to evaluate literature in a variety of multimedia formats and answer the question, "Who Am I?," Students are then asked to create their own multimedia portfolios and Web pages to reflect who they are. L.11-12.3 Language Functions/Style

This video segment adapted from NOVA illustrates why carbon is at the center of life on Earth. It also asks whether carbon-based life might exist on other planets.

What is it that distinguishes a living organism from a nonliving object? This video presents examples that aren't as clear-cut as one might think, enticing students to question what it means to be alive. [3:02]

This site, which is provided for by the University of St Andrews, contains brief biographical information on Jean Robert Argand. Many interesting links at the bottom of the site.

The University of St. Andrews provides a biography on John von Neumann. Learn about his contributions to game theory and computer science.

This University of St. Andrews site provides biographical information and accomplishments of Dedekind.

This eight-hour documentary brings to life Muhammad Ali, one of the most indelible figures of the 20th century, a three-time heavyweight boxing champion who captivated millions of fans across the world with his mesmerizing combination of speed, grace, and power in the ring, and charm and playful boasting outside of it. Ali insisted on being himself unconditionally and became a global icon and inspiration to people everywhere. This collection includes 3 videos and 3 media gallery.

This University of St. Andrews site contains biographical information on the life and accomplishments of Fibonacci.

Three billion years ago single-celled underwater bacteria used sunlight to convert carbon dioxide and water into tiny oxygen bubbles. Soon plants were turning an atmosphere full of volcanic carbon dioxide into oxygen. As we learn in this video segment from Interactive NOVA: "Earth," photosynthesis created a good home for animals and humans, though not for some primitive organisms. They had to retreat to where oxygen couldn't reach them. Join researchers as they search for these organisms, now considered tiny time capsules from a time before there was oxygen on Earth.

This pathway provides an introduction to the scientific method in the context of the life sciences.

This ebook shares the memoir of Mark Twain. The memoir provides insights into the author's experiences when he worked as a piliot on a steamboat that traveled along the Mississippi River. The author begin with a history of the Mississippi River and shares his wit as he describes his experiences during his apprenticeship.

What is it that distinguishes a living organism from a nonliving object? This collection of images presents examples that aren't as clear-cut as one might think, enticing students to question the meaning of life.

This resource is a place for exploring, asking questions, finding information, meeting scientists, and learning about marine ecosystems.

Tour the museum's famed exhibition hall dedicated to ocean life at this online recreation. Find videos, maps, species specimens, and images that let you experience many of the museum's resources on ocean life right from your desktop.

At this site from the Missouri Botanical Garden, you can learn about conifers, needles and the taiga in the fall. Click on the pictures to view a larger version.

This site contains a wealth of information. You can click on shorelines, temperate oceans and tropical oceans. Each page contains links to even more information.

Constellation of articles, images, diagrams, posters, videos, and more on the subject of the search for planets, particularly Earth-like planets, outside our solar system.