Winter, spring, summer, and fall—Earth experiences them all! But what about Mars? Scholars compare the planets in terms of distance, tilt, and rotation during a lesson from PBS's Space series. Great visual models of Earth and Mars, plus...

Encourage positive digital citizenship and healthy blogging habits with a one-page infographic designed to showcase eight pertinent aspects of blogging—netiquette, content curation, copyright, and more! 

See drawing from Hans Christian Orsted's lab notebook showing an experiment in which an electric charge passing through a wire seemed to create a magnetic field!

Here is an interesting look at three of the issues debated in the 1936 election. See a poll taken in 2002 by American Experience to see how a contemporary audience would have voted based on those issues in 1936.

Explore the ways that immigrant women have transformed America socially, politically, and economically.

Select any US state to learn about how the Civil War affected the agriculture and economy of that state.

A number of women played significant roles in the history of aviation and flight during the 20th century. Meet them in this photo gallery and learn about their achievements.

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. This one...

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. Both of these...

At this site from the Georgia State University is where the proof all starts. One must understand this experiment to have any confidence in relativity. Here's the experimental setup and a summary of the data.

Follow Meselson and Stahl through their experiments to determine how DNA replicates.

An interview with Robert Hallek who discusses the foreign policy decisions made by Franklin Roosevelt prior to World War II. Read about the commitment Roosevelt made to Winston Churchill to fight against the Nazis in Europe.

In 1954, a peace conference in Geneva temporarily divided Vietnam in two: a pro-communist North and an anti-communist South. The political factions in North and South Vietnam -- supported by their communist and capitalist allies in the...

A nice map of the island with information on history, places, and events. Click on the map to bring up a larger Cuba map, then you can click on various places to learn more.

Presents a timeline of the history of farming in the U.S. between 1850 and 1933. Highlights include the Homestead Act of 1862, the Agricultural Act of May 1933, Emergency Farm Mortgage Act, and The Federal Surplus Relief Corporation.

After a brief introduction, this site provides information on special relativity include sections such as The Michelson-Morley Experiment, The Postulates of Special Relativity, Lorentz Transformations, The Twin Paradox, Energy is...

As part of a larger exhibit on science and the history of scientific instruments, this site examines a painting by Joseph Wright and its connection to the scientific studies of the vacuum. The painting, which is accompanied by a...

Home of the first state agricultural experiment station.

Scientist performing a chemistry experiment.

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. This one is a...

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. This one...

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. This drawing...

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. In this one,...

How do birds know what direction to fly when they fly south for the winter? This tutorial explains circadian rhythm using an experiment performed with pigeons.