Kibera, a poor community, in Nairobi, was a blank spot on the map until recently. This video from Penn State Public Broadcasting’s Geospatial Revolution shows how geospatial technology enabled residents to map resources to help their community.

The quest for efficiency touched nearly every aspect of American life during World War I, including the nation's clocks. Daylight saving first appeared during the war years as an experiment to save fuel. Theoretically, people would use less artificial light in the evenings thanks to the extra hour of daylight. Urban dwellers generally delighted in the "extra hour," but protests by farmers and other rural citizens brought the experiment to an end after only one year. Farmers, rural Americans, and those whose jobs forced them to work very early hours disliked the measure intensely. They bombarded Congress with petitions, letters, and angry telegrams demanding the return to "God's time." According to farmers, city dwellers who wanted more leisure in the afternoon could just show up for work an hour earlier and leave an hour earlier.

This lesson introduces students to the concepts of air pollution and technologies that have been developed by engineers to reduce air pollution. Students develop an understanding of visible air pollutants with an incomplete combustion demonstration, a "smog in a jar" demonstration, construction of simple particulate matter collectors and by exploring engineering roles related to air pollution. Next, students develop awareness and understanding of the daily air quality and trends in air quality using the Air Quality Index (AQI) listed in the newspaper. Finally, students build and observe a variety of simple models in order to develop an understanding of how engineers use these technologies to clean up and prevent air pollution.

This lesson introduces the MRI Safety Grand Challenge question. Students are asked to write journal responses to the question and brainstorm what information they will need to answer the question. The ideas are shared with the class and recorded. Students then watch a video interview with a real life researcher to gain a professional perspective on MRI safety and brainstorm any additional ideas. The associated activity provides students the opportunity to visualize magnetic fields.

Students are introduced to the Robotics Peripheral Vision Grand Challenge question. They are asked to write journal responses to the question and brainstorm what information they require to answer the question. Their ideas are shared with the class and recorded. Then, students share their ideas with each other and brainstorm any additional ideas. Next, students draw a basis for the average peripheral vision of humans and then compare that range to the range of two different focal lengths in a camera. Through the associated activity provides, students see the differences between human and computer vision.

Explore the world of lines. Investigate the relationships between linear equations, slope, and graphs of lines. Challenge yourself in the line game!

In this video segment adapted from NOVA, watch residents of the Peruvian Andes build a suspension bridge made entirely of grass. The ancient Inca were a textile society and thus skilled in working with natural fibers including alpaca and cotton. Still, it might surprise people today that their solution to crossing the canyons and gorges of their mountainous empire featured another fibrous material: grass. When you consider how they built a simple suspension bridge, you'll realize that not only was this a practical solution, it was also a safe one. In this video segment adapted from NOVA, watch residents of the Peruvian Andes as they build a traditional and functioning grass bridge the likes of which enabled the ancient Inca people to flourish for several hundred years. Grades 3-12.

For four years after the U.S. dropped atom bombs on Hiroshima and Nagasaki to end World War II, America held a monopoly on the production of atomic weapons. On September 24, 1949, however, news of a Soviet Union nuclear weapons test shocked the nation. The following April, a National Security Council report to President Harry S. Truman advised development of a hydrogen bomb--some 1,000 times more destructive than an atom bomb--and a massive buildup of non-nuclear defenses. The subsequent outbreak of war in Korea in June 1950 justified to many increased defense spending. When fighting reached a stalemate, some in politics and the military--including General Douglas MacArthur, head of the Far East command--advocated the use of atomic weapons against targets in China. Although the Korean War was fought solely with conventional weapons, peace came only after the Eisenhower administration threatened to use nuclear weapons. Following the July 1953 armistice, government and military officials debated the place of nuclear weapons in future defense planning. In this January 1954 Collier's article, Styles Bridges, chairman of the Senate Appropriations Committee, laid out various proposals and assured citizens of their leaders' dedication "to finding the best solution." Despite a test ban treaty in 1963--sparked in part by the 1962 Cuban Missile Crisis that brought the U.S. and the Soviet Union to the brink of nuclear war--subsequent arms control agreements, and a vigorous nuclear freeze movement, the two superpowers nevertheless pursued an escalating arms race that reached a peak combined total of nearly 60,000 nuclear warheads by the late 1980s.

Visualize the gravitational force that two objects exert on each other. Change properties of the objects in order to see how it changes the gravity force.

This activity is a field lab where students use a half gallon milk/juice carton containing two raw eggs and "other" materials to design an internal protective structure that will prevent the eggs from breaking from a 50 foot drop off a roof top.

This is a debate-style learning activity in which student teams learn about energy sources and are then assigned to represent the different energy sources. Working cooperatively, students develop arguments on the pros and cons of their source over the others.

How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today. What happens when you add clouds? Change the greenhouse gas concentration and see how the temperature changes. Then compare to the effect of glass panes. Zoom in and see how light interacts with molecules. Do all atmospheric gases contribute to the greenhouse effect?

The marine environment is unique and requires technologies that can use sound to gather information since there is little light underwater. The sea-floor is characterized using underwater sound and acoustical systems. Current technological innovations are allowing scientists to further understand and apply information about animal locations and habitat. Remote sensing and exploration with underwater vehicles allows scientists to map and understand the sea floor, and in some cases, the water column. In this lesson, the students will be shown benthic habitat images produced by GIS. These imaged will lead to a class discussion on why habitat mapping is useful and how current technology works to make bathymetry mapping possible. The teacher will then ask inquiry-based questions to have students brainstorm about the importance of bathymetry mapping.

This towing lab students use a active learning activity to develop planning, problem solving and conceptual skills to clarify understanding of applied and net force. The assessment is the correct composition of a vector diagram.

Students experience haptic (the sense of touch) feedback by using LEGO® MINDSTORMS® NXT robots and touch sensors to emulate touch feedback recognition. With four touch sensors connected to LEGO NXTs, they design sensor attachments that feel physically distinguishable from each another. Then students answer questions and communicate their answers to the NXT by pressing the touch sensor that is associated with the right multiple-choice answer letter. Haptics becomes essential when students must use the NXT sensors to answer the next set of questions without the aid of their vision. This challenges them to rely solely on the tactile feeling of each unique touch sensor attachment that they created in order to choose the correct peripheral slot. Students also learn about real-world applications of haptics technology.

Silicosis, a deadly lung disease caused when workers inhale fine particles of silica dust (found in sand, quartz, and granite), became a national cause clbre during the Great Depression when it was recognized as a significant disease among lead, zinc, and silver miners, sandblasters, and foundry and tunnel workers. While silicosis was a crisis for the federal government, business, and insurance companies as well as labor organizations, its most devastating effects were on the workers who contracted the disease and the families and communities who watched previously healthy men waste away and die. The lasting impact that the silicosis "plague" had on individual workers' lives in the 1930s is evident here in Laurie Mercier's 1981 interview with Helen Raymond, who opened a tavern that catered to miners in Virginia City, Montana, in 1934.

Students explore heat transfer and energy efficiency using the context of energy efficient houses. They gain a solid understanding of the three types of heat transfer: radiation, convection and conduction, which are explained in detail and related to the real world. They learn about the many ways solar energy is used as a renewable energy source to reduce the emission of greenhouse gasses and operating costs. Students also explore ways in which a device can capitalize on the methods of heat transfer to produce a beneficial result. They are given the tools to calculate the heat transferred between a system and its surroundings.

In 1918 and 1919, the Spanish influenza killed 550,000 people in the United States and 20 to 40 million worldwide. In a 1982 interview with Laurie Mercier, Loretta Jarussi of Bearcreek, Montana, described how people would pass through that tiny town seemingly healthy, only to be reported dead two days later. Her father went undiagnosed for many weeks and had plans to go to a nearby hot springs to rest. She believed that her father's death was averted only because the son of the local doctor was an army doctor who recognized flu symptoms that others missed.

Examines the development of computing techniques and technology in the nineteenth and twentieth centuries, particularly critical evaluation of how the very idea of "computer" changes and evolves over time. Emphasis is on technical innovation, industrial development, social context, and the role of government. Topics include Babbage, Hollerith, differential analyzers, control systems, ENIAC, radar, operations research, computers as scientific instruments, the rise of "computer science," artificial intelligence, personal computers, and networks. Includes class visits by members of the MIT community who have made important historical contributions. This course focuses on one particular aspect of the history of computing: the use of the computer as a scientific instrument. The electronic digital computer was invented to do science, and its applications range from physics to mathematics to biology to the humanities. What has been the impact of computing on the practice of science? Is the computer different from other scientific instruments? Is computer simulation a valid form of scientific experiment? Can computer models be viewed as surrogate theories? How does the computer change the way scientists approach the notions of proof, expertise, and discovery? No comprehensive history of scientific computing has yet been written. This seminar examines scientific articles, participants' memoirs, and works by historians, sociologists, and anthropologists of science to provide multiple perspectives on the use of computers in diverse fields of physical, biological, and social sciences and the humanities. We explore how the computer transformed scientific practice, and how the culture of computing was influenced, in turn, by scientific applications.

Many food products, toys, and materials are made through the process of manufacturing. Take a look at the history of manufacturing and conduct some research of your own! Through your research, learn about the history of manufacturing and develop your skills using technology.