Explore the concept of density within states of matter—gases, liquids, and solids—through a group experiment in which young scientists test objects' texture, color, weight, size, and ability to sink or float.    

The carbon cycle isn't a bike which produces carbon and this lesson explains why. Through reading and discussion, groups of pupils create visual explanations of the four parts of the carbon dioxide oxygen cycle. Activities...

Don't be so dense that light bends around you; study the relationship between mass and volume instead. Young chemists measure the density of a variety of liquids and solids. A reading passage and analysis questions introduce pupils to...

Make a splash with young scientists as you teach them all about water using this activity packet. Thirstin, a cartoon glass of water, walks children through the water treatment process, teaches them about different sources of water, and...

Stay safe all year long with a list of safety tips for the home. With pointers about preventing burns, water safety, keeping medication away from children, and poison prevention, among others, the resource is valuable for anyone invested...

Benjamin Franklin's famous aphorisms are a perfect time capsule of colonist values in the mid-18th century, as well as a clever reminder of the way life still works today. Middle and high schoolers select one aphorism to interpret...

To err is human ... and also leads to some hilarious situations. A script introduces readers to Shakespeare's Comedy of Errors, a play full of slapstick humor and other funny elements. Although lacking in activities, the text works well...

A comprehensive summary with interesting facts about the sinking of the Lusitania passenger liner by a German U-Boat that drew the U.S. into WWI.

An informative new resource devoted to the RMS Titanic! Click on any of the main topics for additional details on construction, maiden voyage, sinking of the ship, survivors, artifacts, newspaper articles, videos, and more.

This site provides a short article on the history of the first submarine to engage and sink a warship. Many links to information about its history, preservation and excavation. Includes original US and Confederate Navy documents.

Article explaining what halocarbons are, where they occur in nature as well as man-made sources, how they are used, and their negative environmental impact. (Published: October 28, 2011)

The Carnot cycle is described, illustrated and explained. The Carnot efficiency equation is given and interactive JavaScript form allows the visitor to investigate the effect of the reservoir temperature and the sink temperature upon the...

The Naval Historical Center offers straightforward facts and information from the US Coast Guard about the area known as "The Bermuda Triangle." While the site does not deny that there have been some disappearances and "traceless...

This site contains pictures, charts and general information on Germany's use of submarine warfare. It focuses on the second phase of submarine usage, i.e., to disrupt trade lines and enforce embargos.

The heat engine cycle is defined and discussed. So pressure-volume diagrams are introduced and their use in depicting the cycles of a heat engine is demonstrated. Informative graphics are accompanied by reason-filled explanations.

Thought provoking entry discusses the many outrageous ideas about the so-called mysterious disappearances of the Bermuda Triangle area in the Atlantic Ocean.

Concise account of the destruction of the German navy's flagship, the Bismarck, during World War II.

Discusses what triggered World War I, why the United States joined the war, and the impact the war had on life in the United States. Includes questions for students at end.

Describes the events leading up to America's entry into World War I and the changes that took place in America soon after. These included legislation such as the Selective Service Act and the Espionage and Sedition Acts, protests by...

The importance of the carbon cycle, how it works, the sources of carbon, and the steps in the carbon cycle are explained here.