This set of questions and answers allows you to measure your awareness of Native American influences in U.S. history and culture.

Native American groups had to choose the loyalist or patriot cause"”or somehow maintain a neutral stance during the Revolutionary War. Students will analyze maps, treaties, congressional records, first-hand accounts, and correspondence to determine the different roles assumed by Native Americans in the American Revolution and understand why the various groups formed the alliances they did.

After more than 30 years in prison and an historic election that for the first time in the nation's history included all citizens regardless of race, Nelson Rolihlahla Mandela became President of the Republic of South Africa on May 10, 1994. This Teacher's Guide includes resources for teaching about the brutality of apartheid, the resilience of the nation's people, the leadership of Nelson Mandela, and primary source materials that will inform discussion about the country's emergence in the world.

Produce light by bombarding atoms with electrons. See how the characteristic spectra of different elements are produced, and configure your own element's energy states to produce light of different colors.

Stimulate a neuron and monitor what happens. Pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane.

Play with a 1D or 2D system of coupled mass-spring oscillators. Vary the number of masses, set the initial conditions, and watch the system evolve. See the spectrum of normal modes for arbitrary motion. See longitudinal or transverse modes in the 1D system.

In this lesson, students will learn about the lifestyle of the wealthy elite and then expand their view of medieval society by exploring the lives of the peasants, craftsmen, and monks.

Students study the interaction between environment and culture as they learn about three vastly different indigenous groups in a game-like activity that uses vintage photographs, traditional stories, photos of artifacts, and recipes.

While Paul Revere's ride is the most famous event of its kind in American history, other Americans made similar rides during the Revolutionary period.  After learning about some less well known but no less colorful rides that occurred in other locations, students gather evidence to support an argument about why at least one of these "other riders" does or does not deserve to be better known.

For more than 400 years, Shakespeare's 37 surviving plays, 154 sonnets, and other poems have been read, performed, taught, reinterpreted, and enjoyed the world over. This Teacher's Guide includes ideas for bringing the Bard and pop culture together, along with how performers around the world have infused their respective local histories and cultures into these works.

Start a chain reaction, or introduce non-radioactive isotopes to prevent one. Control energy production in a nuclear reactor! (Previously part of the Nuclear Physics simulation - now there are separate Alpha Decay and Nuclear Fission sims.)

Start a chain reaction, or introduce non-radioactive isotopes to prevent one. Control energy production in a nuclear reactor! (Previously part of the Nuclear Physics simulation - now there are separate Alpha Decay and Nuclear Fission sims.)

Using archival material, students will associate Francis Scott Key's Star Spangled Banner with historic events and recognize the sentiments those words inspired. Students will explore the symbolic nature of the American flag.

See how the equation form of Ohm's law relates to a simple circuit. Adjust the voltage and resistance, and see the current change according to Ohm's law. The sizes of the symbols in the equation change to match the circuit diagram.

See how the equation form of Ohm's law relates to a simple circuit. Adjust the voltage and resistance, and see the current change according to Ohm's law. The sizes of the symbols in the equation change to match the circuit diagram.

Looking at historic maps of the West, students can begin to appreciate the immensity and mystery of the mission Lewis and Clark accepted.

This lesson reminds students that they, too, make choices about whether to stand aside—or stand up—when someone else is being maligned, bullied or harassed. In standing up, we honor not only the other person’s humanity, but also our own.

Challenging math problems worth solving.

The name “Open Middle” might sound like a strange name for a website about math problems. However, it references a very specific type of problem we try to encourage here. Most of the problems on this site have:
* a “closed beginning” meaning that they all start with the same initial problem.
* a “closed end” meaning that they all end with the same answer.
* an “open middle” meaning that there are multiple ways to approach and ultimately solve the problem.

Open middle problems generally require a higher Depth of Knowledge than most problems that assess procedural and conceptual understanding. They support the Common Core State Standards and provide students with opportunities for discussing their thinking.

Explore an active area of research in optical physics: producing designer pulse shapes to achieve specific purposes, such as breaking apart a molecule. Carefully create the perfect shaped pulse to break apart a molecule by individually manipulating the colors of light that make up a pulse.