Video introduces wind energy research at the National Renewable Energy Lab (NREL) and provides an overview of the NREL Wind Technology Center near Boulder, Colorado.

In this activity, students use Google Earth to investigate ideal features of wind farms.

This is a utility-scale, land-based map of the mean annual wind speed 80 meters above the ground. This map can be used to evaluate the potential for wind energy in the US. State maps and more information are linked from the main map.

This activity introduces wind energy concepts through a reading passage and by answering assessment questions. The main section of the activity involves constructing and testing a windmill to observe how design and position affect the electrical energy produced.

Students go through the design process and the scientific process to test the effect of blade design on power output. There is an optional extension to use the data to create an optimal set of wind turbine blades.

At the beginning of each month, students will read and discuss that month's essay from Aldo Leopold’s A Sand County Almanac. They will then use the Wisconsin Almanac Siftr to document the seasonal changes in the natural world around them. At the end of each month, students explore the Siftr postings from their peers and identify any patterns they see in data.

This video illustrates the advantages of woody biomass as a renewable, carbon-neutral energy source. Woody biomass is underutilized and often overlooked as a renewable fuel, and it can be harvested sustainably and burned cleanly.

Students learn about trigonometry, geometry and measurements while participating in a hands-on interaction with LEGO® MINDSTORMS® NXT technology. First they review fundamental geometrical and trigonometric concepts. Then, they estimate the height of various objects by using simple trigonometry. Students measure the height of the objects using the LEGO robot kit, giving them an opportunity to see how sensors and technology can be used to measure things on a larger scale. Students discover that they can use this method to estimate the height of buildings, trees or other tall objects. Finally, students synthesize their knowledge by applying it to solve similar problems. By activity end, students have a better grasp of trigonometry and its everyday applications.

Students investigate passive solar building design with a focus on heating. Insulation, window placement, thermal mass, surface colors, and site orientation are addressed in the background materials and design preparation. Students test their projects for thermal gains and losses during a simulated day and night then compare designs with other teams for suggestions for improvements.

Photographers covered the Civil War, following the Union Army in wagons that served as traveling darkrooms. Their equipment was bulky and the exposures had to be long, so they could not take action photographs during battle. But photography was graphic; this picture taken on the morning of July 4th, 1863 after three days of heavy fighting during the Battle of Gettysburg, showed the northern public that dying in battle lacked the gallantry often represented in paintings and prints.

In the 1820s, operatives in the Lowell cotton mills, mostly women, worked twelve hours a day, six days a week. Holidays were few and short: July Fourth, Thanksgiving, and the first day of spring. In the 1830s, with increased competition, conditions worsened as owners cut wages, raised boarding house rents, or increased workloads. To protest these changes, women went out on strike in 1834 and 1836. This promotional engraving showed a mill woman standing in unlikely repose beside a Fale and Jenks spinning frame. The benign relationship of the figure to the machine may have served to reassure nineteenth-century observers that factory work would not debase virtuous womanhood.""

Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize the relative number of hydroxide ions and hydronium ions in solution. Switch between logarithmic and linear scales. Investigate whether changing the volume or diluting with water affects the pH. Or you can design your own liquid!

A worker performs his job for efficiency experts with small lights attached to his arms and hands. This "cyclegraph," a photograph taken by an open-shutter still camera, was invented by time-and-motion specialist Frank Gilbreth to chart workers' movements in mass-production jobs. Gilbreth claimed that the device would help to eliminate useless movement and turn work into a rigid arrangement of "efficient" motions. Many managers embraced this and other techniques for "scientific management" in the early twentieth century to increase productivity by simplifying and standardizing the tasks of workers. Scientific management also gave managers better control over their workforce, since it meant that formerly skilled jobs could be broken into tasks and divided amongst several easily replaceable unskilled workers.