When DNA research first began, it required almost an entire day to extract the molecules from a cell nucleus. Now it requires less than an hour. Scholars learn about the early theories of DNA with an online interactive, videos,...

Scholars analyze a propaganda poster against communism. The resource uses the poster to examine the domino theory and containment policies used by the United States to stop the spread of communism in Vietnam. Scholars work in pairs or...

What happens to radio waves, time, and light in and near a black hole? Young scientists explore what is known about observing frequency and time at various distances from a black hole. They control the size of the black hole and the...

How is a molecule's shape determined? Explore bond angles, lone pairs, and VSEPR theory through a logic-based activity. Chemists pull together information about the major molecular shapes, then use it to solve puzzles.

Scholars take off on an interactive spaceship to explore a historical timeline of the big bang theory. They learn about the evolution of mammals and humans, the formation of stars and planets, and the chemical composition of the early...

A website all about planetary mysteries—it's a one-stop-shop for all things, stars, planets, and space travel. Scholars read an astronomy overview to discover the page's big ideas, then choose from the plethora of resources, including...

Some genes link to others that have implications for inheritance. A set of resources lead pupils through the history of this discovery. They explain how chromosomes recombine and which parts are more susceptible to this linkage....

The breakthrough of Mendelian genetics solved many puzzles for biologists. Then, scientists decided to apply the theory to human behavior. Learn the story and struggle of finding a genetic explanation for hobbies, interests, and mental...

In this magnetism worksheet, students answer ten questions about magnets, their magnetic poles, the magnetic lines of flux and how magnets work.

In this geometry worksheet, students draw an illustration of a circle centered between two points. They draw three line segments. Students answer two questions about the resulting angles. A sample, interactive drawing is included with...

In this online interactive history worksheet, students respond to 10 short answer and essay questions about Sigmund Freud and his work. Students may check some of their answers on the interactive worksheet. 

In this online interactive philosophy activity, students respond to 10 short answer questions about Lysis by Plato. Students may check some of their answers on the interactive activity.

In this literature worksheet, students respond to 12 short answer and essay questions about Emerson's Essays. Students may also link to an online interactive quiz on the novel at the bottom of the page.

In this online interactive literature worksheet, students respond to 10 short answer and essay questions about Machiavelli's The Prince. Students may check some of their answers online.

For this literature worksheet, students respond to 25 short answer and essay questions about Shakespeare's Richard III. Students may also link to an online interactive quiz on the selection at the bottom of the page.

In this online interactive philosophy worksheet, high schoolers respond to  short answer and essay questions relating to presocratics.

In this online interactive English vocabulary skills worksheet, students answer 10 matching questions which require them to fill in the blanks in 10 sentences. Students may submit their answers to be scored.

In this online interactive history activity, students respond to 10 short answer and essay questions about Locke's Second Treatise on Civil Government.

For this static electricity worksheet, students complete nine questions about electron charges, coulombs, potential energy, voltage and the Van de Graaf generator.

In this intermediate sentence completion exercise 31 activity, students complete 10 sentences interactively by selecting the word(s) given, with immediate feedback.

For this cite, sight, and site worksheet, students choose the correct word to complete each sentence. Students choose cite, sight, or site for 45 sentences.

Einstein's general theory of relativity is the subject of this interactive OLogy card. Turn it over to find fast facts, questions and answers, and other bite-size pieces of information about the theory.

Flip over this interactive OLogy card to find short overviews, fact-or-fiction questions, and similar bite-size bits of information about the nature of time, time travel, atomic clocks, and the general theory of relativity.

Become a game show contestant in this online activity from A Science Odyssey and ask a series of questions to a panel of mystery scientists, using the answers to determine which scientist is Einstein.