## Story Weaver

Reflect on a medieval tapestry and write a story about what you think is going on. Read stories that other site visitors have written about the tapestry.

## Subdividing Area

To find the area of a shape, surround the shape with a rectangle, determine the areas of the rectangle and subtract the pieces of the rectangle that are outside the original shape. Use this geoboard to create shapes and determine their areas.

## Symmetry

Observe the parameters for symmetry groups using common motions, such as rotation and reflection. Experiment with wallpaper patterns to learn about requirements of a group.

## Syntax Store

The colors listed in the boxes represent different parts of speech: noun, verb, adjective, adverb, etc. Figure out which colors represent which part of speech and then use the colors to create proper sentences.

## Taxicab Treasure Hunt

To find a hidden treasure use taxicab geometry, a special kind of geometry that counts in city blocks. Pick an intersection, ask the computer how far it is to the treasure and get the distance using taxicab geometry.

## Testing Your Measurement Bias

There are many sources of variation in data, including random error and bias. Observe the difference between error and bias in this line matching exercise.

## Thinking About Slope

Explore the concept of slope. Ask yourself why the slope between pairs of points would change or why it would stay the same.

## This Just In

Different forms of media can present different views of the same story. See how your point of view might change as you read an article, watch a news clip and read an online article about the same event.

## Three-Noodle Summary

Practice locating the median for odd and even data sets. Consider the information you can glean from a set of data even if you only have Min, Med and Max.

## Timeline: Global Politics Recap

Reveal key foreign policy decisions through U.S. history. Select “You Decide” to test your knowledge.

## Timeline: History of Psychology

Learn about the historical foundations of contemporary psychology. Use the timeline to explore key events, publications, and perspectives that have shaped psychology from the late 19th century to the present.

## Timeline: Pre-Columbian America to 2005

This timeline gives a contextual view of major events from from Pre-Columbian America to 2005. Each period covers a unit in the America's History in the Making course.

## The Towers Problem

Build as many different looking towers as is possible, each exactly four cubes high using two colors of Unifix® Cubes. Convince yourself and others that you have found all possible towers four cubes high and that you have no duplicates.

## Tracing the Path

Draw arrows connecting the sources of energy to the receivers of energy. Remember that some sources of energy have more than one receiver and some receivers of energy have more than one source.

## Transform the Rock

There are five processes that can change rocks over time. Pick the process that has changed each rock from one type to another and then identify the process that cycles each rock from magma to rock and back to magma.

## Transforming a Circle

You can find the areas of different polygons by dissecting the polygons and rearranging the pieces into a recognizable simpler shape. Cut a circle into wedges and fit them together to form a crude parallelogram.

## Trigonomic Functions

Use a trigonometry calculator to explore the ratios of sides of a right triangle. Do the sine, cosine and tangent have maximum or minimum values?

## Tulip Gardens

Track tulip growth as the season changes from winter to spring. See how temperature, rainfall and sunshine affect growth and help scientists look for patterns of climate change.

## Tungurahua Timeline

The Tungurahua volcano in Ecuador has gone through a series of active and dormant periods. Follow the volcano's activity from 1773 to 2000, including a scene of an explosive eruption in 1999.

## United States History Map

Become a geography whiz as you learn how the United States was settled. Discover how the continent was irrevocably changed by European colonization, the events that caused the wholesale displacement and decimation of the land's original inhabitants, and how the 50 states came to be formed.