Dilemmas and Debates in Entrepreneurship
This is a course about dilemmas and debates. A dilemma is "an argument presenting two or more equally conclusive alternatives; a choice or a situation involving choice between equally unsatisfactory alternatives; a problem seemingly incapable of a satisfactory solution". The process of entrepreneurship involves the recognition of challenges and dilemmas, vigorous debate, and ultimately, solutions. No solution lasts long in an entrepreneurial milieu whose underpinning is "creative destruction". Y
Author(s): No creator set

License information
Related content

Schools Demining Schools
Land mines are silent, secret weapons. They have been placed in over 60 countries around the world. In this web site, you can learn about these dangerous weapons and how you can help make the world safe from land mines.
Author(s): No creator set

License information
Related content

Social Attitudes and Public Opinion
This course examines the nature of attitudes, beliefs, and values, and the influences which indiviudals' attitudes have upon their behavior. Various theories of attitude organization and attitude change are discussed, and the development of social attitudes is explored by examining the differential impact of the family, the educational system, the mass media, and the general social environment. The changing content of public opinion over time and its relationship to the political system are also
Author(s): No creator set

License information
Related content

Calculate the Top Quark Mass
Students use conservation of momentum to calculate the mass of the top quark. This activity examines the fingerprint of a top/antitop production that took place in the D-Zero Detector at Fermilab on July 9, 1995. This activity will build on student understanding of vector addition and depends upon only a small amount of particle physics explanation.
Author(s): No creator set

License information
Related content

Volcanic Violence
Volcanoes are big movers and shakers in the business of continually redesigning the Earth's landscape. With no concern for nearby people or ecosystems, volcanoes release toxic gases, climate-altering ash, lava and rock. How does this work? Are scientists getting better at predicting volcanic eruptions? How do areas recover after destruction?
Author(s): No creator set

License information
Related content

Calculating Molecular Weight
The molecular weight is the mass of one mole of a substance. Usually, the units used for this are grams per mole. In this movie, we show how to calculate the molecular weight of a substance from the atomic weights given on the periodic table. On another page, we use the molecular weight to convert between the macroscopic scale (grams of a substance) and the microscopic scale (number of molecules of that substance).
Author(s): No creator set

License information
Related content

Mixed Reception Scenario
This activity is set in a research group that is developing an antivenom for spider bites. In the opening scene, Nelson Pogline, a talented graduate student, dies unexpectedly at a university reception. As a detective, you must use chemistry concepts to determine if this was murder and if so, solve the case. You can interview suspects using Quicktime movies, investigate the crime scene for clues with Quicktime Virtual Reality images, and analyze the evidence from the crime lab. This activity req
Author(s): No creator set

License information
Related content

Body With Thruster Model
The Body with Thruster Model shows the motion of a disk with an attached rocket engine. You can drag the engine to change its distance from the center of the disk and you can adjust the thrust of the rocket engine using sliders. The mass of the rocket and its connecting rod are assumed to be negligible. The trajectory of this single-body model is intuitively challenging and difficult to visualize.
Author(s): No creator set

License information
Related content

Lennard-Jones Potential Model
The EJS Lennard-Jones Potential model shows the dynamics of a particle of mass m within this potential. You can drag particle to change its position and you can drag the energy-line to change its total energy. The Lennard-Jones potential function is a reasonably accurate model of interactions between noble gas atoms.  The binding energy epsilon is the depth of the potential well and minimum molecular separation are set equal to unity.  This simulation uses uses a natural system of units the m
Author(s): No creator set

License information
Related content

Anisotropic Oscillator Model
The EJS Anisotropic Oscillator model displays the dynamics of a mass connected to two opposing springs. The simulation displays the motion of the mass as well as the trajectory plot. The initial position of the mass can be changed by dragging. The unstretched lengths of the springs can changed as well via textboxes.
Author(s): No creator set

License information
Related content

Peace Games: Peace Dove
Play a game and find out about a Nobel Prize awarded discovery or work! Several people and organizations have received the Nobel Peace Prize for their efforts concerning nuclear weapons disarmament. Worldwide, the white dove is a symbol for peace. Take on the mission to disarm the world of nuclear weapons! ...
Author(s): Creator not set

License information
Related content

Rights not set

Letters From the Diaspora - Writing Letters From the Perspective of a Historic Migrant
In this lesson, students share opinions about the causes of mass migration. They then investigate the causes and effects of an event that led to a mass migration, and write letters from the perspective of a person who might have lived through that period.
Author(s): No creator set

License information
Related content

Pioneer Life With Laura
Through literature, both fiction and nonfiction, the learner will develop an understanding of and an appreciation for: Why pioneers left their homes and families to journey west; The hardships pioneers faced on the journey and as they built a new life on the frontier; Family life on the frontier; Building a community; Destruction of the way of life of the Plains Indians and their forced movement to reservations; Effects the pioneers had on the natural environment.
Author(s): No creator set

License information
Related content

The fastest CME of Cycle 23 overtakes another fast CME
On November 4, 2003, the Sun produced its fastest coronal mass ejection (CME) for cycle 23 out of the active region 0486 located near the southwest limb of the Sun. The CME was expelled with a speed of approximately 2700 km-s. At the time of the launch of this CME, there was another ejection in progress ...
Author(s): Tom Bridgman,Natchimuthuk Gopalswamy

License information
Related content

Rights not set

Solar Activity Heats Up
This article presents text, images, and animations of a solar flare and coronal mass ejection that occurred in August 1999. Links to related topics and articles are included
Author(s): Creator not set

License information
Related content

Rights not set

Soil Particle Density Protocol
The purpose of this resource is to measure the soil particle density of each horizon in a soil profile. Students weigh a sample of dry, sieved soil from a horizon, mix it with distilled water and then boil the mixture to remove any air. The mixture cools for a day and then students add water until the volume of the mixture is 100 mL. Students measure the temperature and mass of the final mixture and use the Soil Particle Density Data Sheet to calculate the soil particle density. Three samples sh
Author(s): No creator set

License information
Related content

Gravimetric Soil Moisture Protocols
The purpose of this resource is to measure soil water content by mass. Students collect soil samples with a trowel or auger and weigh them, dry them, and then weigh them again. The soil water content is determined by calculating the difference between the wet sample mass and the dry sample mass.
Author(s): No creator set

License information
Related content

Space Weather Research Explorer
looks at how the sun creates a changing set of conditions in space. Learn about coronal holes, solar flares, coronal mass ejections, solar wind, magnetosphere, and auroras. See photos, graphs, and live data. Make your own space weather predictions.
Author(s): No creator set

License information
Related content

Henry F. Owens, III, comments on the death of Levi Hart
Excerpt from the Say Brother program investigating the events the night Levi Hart, a 14-year-old African American youth from Roxbury, Mass., was killed in a police chase. Hart, and two other Roxbury youths had stolen and car. When the officers caught up to them, Hart was shot, arguably by Richard Bourque, in an act of police brutality. Hart family attorney, Henry F. Owens, III, talks about the treatment minorities receive on the criminal side of the court, and the belief police were not going to
Author(s): Creator not set

License information
Related content

Rights not set

GEOLogic: The Big Five Mass Extinctions
GEOLogic questions are puzzles that were developed to support students understanding of geoscience concepts while challenging them to develop better logic and problem solving skills. In this exercise, students are asked to match up the five largest mass extinction events with their relative dates, approximate duration, and severity (percentage of species that became extinct) based on clues given from various perspectives. This activity is appropriate for a high school science class or an introdu
Author(s): No creator set

License information
Related content