Balance and flux
Ecosystems and populations of organisms within ecosystems function by the principle of balance and flux. Balance can be thought of as a state of equilibrium, or a state of equal changes between two sides. Flux can be thought of as a rate of flow or changes. Even small changes in an ecosystem's or population's balance and flux could lead to disaster.
Celery in pure water
The celery stalks take up the water and continue to live in this environment.
Female Artemia closeup
Close-up full body view of a female Artemia under one quarter-inch in size.
Cumulative Earthquake Activity from 1980 through 1995 (WMS)
This animation shows a cumulative view of earthquake activity for the whole world from 1980 through 1995. Each dot on the image represents the number of earthquakes with magnitude greater than 4.2 that have occurred in a 0.35 by 0.35 degree area of the globe since January 1, 1980. A yellow dot represents 1 or 2 earthquakes, an orange dot represents about 10 earthquakes, and a red dot represents 50 to 200 earthquakes. The background image, if present, shows the topography of the ocean floor. As t
North America NDVI 1993 August
NDVI in North America for August 1993, based off data collected over the 1981-2000 time frame.
Arctic Ozone Hole from Earth Probe TOMS: February 1, 1997 through May 31, 1997
Ozone measurements from Earth Probe TOMS for February 1, 1997 through May 31, 1997 showing the formation of an Arctic ozone hole
Principles of Industrial Hygiene
Principles of Industrial Hygiene provides an introduction to the field of industrial hygiene and to occupational health in general. The instructor focuses on introducing concepts, terminology, and methodology in the practice of industrial hygiene and identifies resource materials. The class would benefit those wishing to pursue a Master's degree in industrial hygiene, those wishing to complete a certificate in occupational health, or for students in allied health fields needing a basic understan
Pharmaceuticals Management for Under-served Populations
Students will be guided to analyze problems and develop strategies based on real world drug management issues including regulations, manufacture, procurement, distribution, safety, policy, financing and the unique aspects of international pharmaceutical trade, the role of the World Trade Organization - Trade-Related Aspects of Intellectual Property Rights (WTO-TRIPS), government, non-governmental organizations (NGOs) and individuals/programs in the selection and use of pharmaceutical products. C
Examines health issues, scientific understanding of causes, and possible future approaches to control of the major environmental health problems in industrialized and developing countries. Topics include how the body reacts to environmental pollutants; physical, chemical, and biological agents of environmental contamination; vectors for dissemination (air, water, soil); solid and hazardous waste; susceptible populations; biomarkers and risk analysis; the scientific basis for policy decisions; an
Introduction to Economics
Introduction to Economics is designed to build an understanding of economic institutions, history, and principles. In addition, it will focus on relationship between private and public sectors of the U.S. economy. Also, it will analyze major economic institutions, such as property rights, markets, business organizations, labor unions, money and banking, trade, and taxation.
Introduction to Microeconomics
This course is designed to help you build an understanding of the economics of the market place. In particular we focus on microeconomic principles that demonstrate the role and limitations of both competitive and imperfectly competitive markets in motivating socially efficient consumer, business, and public sector choices.
Understanding Online Interaction
This course is designed to provide an introductory level of understanding of the manner in which individuals interact with one another via the network. Possession of this understanding is absolutely critical to your ability to design effective learning environments on the network. This course takes an immersion approach to helping you develop your understanding by requiring you to make extensive, reflective use of several representative interactive media. You will also read several representativ
Space Propulsion, Spring 2004
Reviews rocket propulsion fundamentals. Discusses advanced concepts in rocket propulsion ranging from chemical engines to electrical engines. Topics include: advanced mission analysis, physics and engineering of microthrusters, solid propellant rockets, electrothermal, electrostatic, and electro-magnetic schemes for accelerating propellant. Some coverage is given of satellite power systems and their relation to propulsion systems. Space Propulsion begins with a review of rocket propulsion fundam
Common Core State Standards: Middle School
Visit two middle school English and math classrooms who have already begun to adapt to the new Common Core standards, and see what changes teachers are making in their practice to adapt to the new standards. (14:09)
ESD.00 Introduction to Engineering Systems (MIT)
Students in ESD.00 work on projects to address large, complex and seemingly intractable real-world problems, such as energy supply, environmental issues, health care delivery, and critical infrastructure (e.g., telecommunications, water supply, and transportation). The course introduces interdisciplinary approaches - rooted in engineering, management, and the social sciences - to considering these critical contemporary issues. Small, faculty-led teams select an engineering systems term project t
Egyptian Sarcophagus Paper-Craft
This video shows the assembly of a paper-crafted Egyptian sarcophagus.
( This set shows a set of three nesting boxes.) Teachers could show this to students studying Egyptian history before having them design their own sarcophaguses. ( 4:17)
History of Royal Weddings
Royal marriages have changed in the last century. They were once purely political affairs, matching a prince up with a princess of another royal family. This 2:34 video explains the reason for many such marriages with the emphasis on current marriages.
We Sign Animals: A Song About Animals in Sign Language
In this video, an instructor demonstrates using sign language to sign a song about a parade of animals. She then performs the song with sign language as she sings along. The animals in the song are a rooster, horse, cow, goat, pig, and mouse. (While the song is appropriate for young children, anyone learning sign language could benefit from this video.) (02:25)
Aching thumbs? Try the virtual keyboard
Jan. 9 - Smartphone and tablet PC users who miss their conventional keyboard need miss it no longer, thanks to the latest creation from South Korean company, Celluon. The company has produced a virtual keyboard which enables users to tap on any flat surface, be it a desk, table or even a wall. Rob Muir reports.
PhrasalVerbWorkout App for iOS
'PhrasalVerbWorkout is an interactive study aid which helps learners find paths through the forest of English phrasal verbs.Over 600 separate phrasal verbs, distributed on four levels from core up to advanced, are practised in small groups which share a common adverb and meaning.More than a hundred workouts incorporate thousands of samples handpicked from literature, music, film and popular culture.Notes on semantics and syntax, and a searchable phrasal verb database complete an entertaining and