The transit of Venus is a rare astronomical event that has been well documented throughout history. The most recent transit occurred in June of 2004, and the one before that took place more than 100 years earlier in 1882. This site from the South African Astronomical Observatory provides information and first-hand observations of the 1882 event from Wellington, South Africa. Just prior to the event, an observatory was erected at the Huguenot Seminary for girls, and some of the historical observations made from that site in 1882 are provided here for your perusal.

This article and included graphs,from the web site accompanying the FRONTLINE NOVA special What's Up with the Weather?, reveals how atmospheric carbon dioxide, methane, and nitrous oxides from coal- and oil-burning power plants, cars, and other fossil-fuel-burning sources have climbed along with the world population, with as yet unknown effects on the climate system.

This movie shows a total eclipse of the Sun which occurred in 1994. It is accompanied by a link to a written description of the Sun's physical characteristics.

This page hosts a collection of geometric tasks in pdf format that are aligned to the CCSS standards 1.G1 through 1.G3. It also has links to supplementary literature and learning materials.

This resource contains handouts and presentations from the 2013 Center for Advanced Automotive Technology (CAAT) Conference: Preparing the Workforce for the Automotive Technology of 2025. This conference took place on May 30, 2013 at Macomb Community College's South Campus in Warren, MI and was attended by more than 80 individuals representing various high schools, community colleges, and universities as well as multiple government agencies, professional organizations, and industry workforce representatives. The purpose of the conference was to explore how the technologies of 2025 will affect required job skills.

This resource contains presentations from the Center for Automotive Research (CAR) 2014 Management Briefing Seminars held August 4-7, 2014. With attendees from industry, government, media, and academia, the event featured outstanding presentations from industry thought leaders as well as various networking and social events. Using CAR research as a foundation, these seminars revolved around the most important issues facing the automotive industry today: manufacturing, powertrain, sales forecasting, connected and automated vehicles, purchasing, talent, and supply chain.

This resource contains a presentation from a webinar and video of the webinar regarding a study carried out by Ducker Worldwide and funded by The Aluminum Association to evaluate the aluminum content in 2015 model year vehicles and the projected aluminum content growth through 2025. Also included is the executive summary of the study.

This NASA page is an image set illustrating the 20g centrifuge at the Ames Research Center. The photographs include two of human subjects strapped in the place at one end of the centrifuge arm.

The University of Minnesota Biocatalysis/Biodegradation Database (UM/BBD) contains "microbial biocatalytic reactions and biodegradation pathways primarily for xenobiotic, chemical compounds." A new microbial enzyme-catalyzed reactions has been posted for 2,4-Dichlorophenoxyacetic Acid. 2,4-dichlorophenoxyacetic acid (2,4-D) is used in cultivated agricultural areas, rangeland and pastures, forests, and homes or gardens, and is "a chlorinated phenoxy compound [that] functions as a systemic herbicide and is used to control many types of broadleaf weeds." The degradation pathway map includes organisms which can initiate the pathway. The pathway map provides detailed information on each hyperlinked step, including graphics, product/substrate reactions, and external links to further information.

This webpage features images of hominid skulls dating from 2.6 million years ago to the present. It illustrates the similarities between skulls and demonstrates the manner in which hominid skulls have gradually evolved towards the modern homo sapiens skull.

The Two Micron All Sky Survey at IPAC website provides an image gallery of the solar system's objects, Jupiter's moons, H II regions, star formation regions, and reflection nebulae, open star clusters, globular star cluster, young stellar objects, planetary nebulae, supernova remnants, various IRAS sources, galaxies, as well as galaxy groups and clusters.

On July 14, NASA announced the public release of a huge collection of images (1.9 million) from the Two-Micron All Sky Survey (2MASS), the most thorough census of stars ever made. Using two automated, 51-inch telescopes, one in Arizona and the other in Chile, the three-year-old survey has so far taken images of half a million galaxies and 162 million stars. By its completion, the survey's catalogs will contain more than 300 million objects. A sampling of these images has been placed online at the 2MASS site at the Infrared Processing and Analysis Center (IPAC) at the California Institute of Technology. The twelve-page gallery contains some amazing images, including the center of the Milky Way, the Sombrero galaxy, the Crab Nebula, and the Dark Nebula, offered as large thumbnails which link to a full-sized image. Users can learn more about 2MASS at the survey's homepages at Caltech and the University of Massachusetts.

This page hosts a collection of geometric tasks in pdf format that are aligned to the CCSS standards 2.G1 through 2.G3. It also has links to supplementary literature and learning materials.

Build your own polygon and transform it in the Cartesian coordinate system. Experiment with reflections across any line, revolving around any line (which yields a 3-D image), rotations about any point, and translations in any direction.

These zipped documents from MatEd provide information on designing a course on 3 Dimensional Digital Laser Scanning Fundamentals. At the end of the course, students will be able to identify applications for 3 dimensional digital laser scanning, operate a NextEngine brand 3 dimensional digital laser scanner, and have proposed a project to reinforce these concepts. The documents include a draft syllabus, contact information for the author of the course, a sample new course proposal form, and a course outline.

This page hosts a collection of geometric tasks in pdf format that are aligned to the CCSS standards 3.G1 and 3.G2. It also has links to supplementary literature and learning materials.

This web site, hosted by the University of Chicago Dept. of Astronomy and Astrophysics, is an image gallery of the Yerkes 40 inch refracting telescope--the largest refractor in the world. It includes views of the telescope, the machinery that turns it, and the observatory building. Links go to other parts of the Yerkes website.

This page hosts a collection of geometric tasks in pdf format that are aligned to the CCSS standards 4.G1 through 4.G3. It also has links to supplementary literature and learning materials.

In 1953, Gottfried Moellenstedt invented the electron biprism, more or less by accident, with the serendipity characteristic to him: Aiming at dark-field imaging in an electron microscope, he stretched a thin tungsten wire across the objective aperture to block off the zero beam. However, instead of a dark field image, because of inadvertent charging of the wire under the beam, he found two images of the ZnO-needles serving as an object. Instead of trying the dark field imaging over and over again, he asked what the effect would be if the obtained two images were superimposed. Is coherence given? Moellenstedt, educated by Walther Kossel in diffraction of electron waves, had a vision: Together with his PhD-student Heinrich Dueker, he developed the electron biprism, consisting of a 1 micron m thin wire deliberately chargeable by means of a voltage source, as a beam splitter for coherent superposition of the electron waves passing the filament on the right and on the left. In 1955 they published the first results showing biprism interference fringes [G. Moellenstedt and H. Dueker, Naturwiss. 42, 41 (1955)], which, since then, gave access to the understanding of electron waves and their use for analysis of object structures up to atomic dimensions. Target Audience: 2-4 Year College Faculty/Administrators

This resource page from the Betsy Ross site provides historical background and step-by-step directions to make a 5-pointed star. Also included is a link to an animated demonstration.

This page hosts a collection of geometric tasks in pdf format that are aligned to the CCSS standards 5.G1 through 5.G4. It also has links to supplementary literature and learning materials.

This resource introduces students to the Dry Valleys of Antarctica, the largest area on the continent that is not covered by ice. Materials include a map and some brief facts about Antarctica and the valleys, such as size, location and physical properties (temperature, precipitation and others), and an online journal in which participants in the Dry Valleys Long-Term Ecological Research (LTER) project discuss what it is like to live and work there. The journal entries include descriptions of some of the organisms that inhabit the extreme environments of the valleys, physical features of the valleys, and the strange mummified bodies of animals such as penguins and seals that have been preserved in the cold, dry climate. There is also a glossary of acronyms used in the project and a set of links to other websites with additional information about the Dry Valleys.

9th Grade Math Practice Questions to test addition, multiplication, word-problem skills, and basic algebraic skills. Includes answers and explanations. From the Proficiency Building Activities of the NASA Lewis Research Center K-12 Program.

The AAAS (American Association for the Advancement of Science Atlas of Population and Environment is an important analysis of the relationships between human population and the environment. Through text, maps, and diagrams, the Atlas illustrates how population affects the world's ecosystems and natural resources both in the short and long term. Using sophisticated mapping and graphic techniques, the Atlas provides quantitative analyses of the important links between such factors as human population density, rates of growth, migration, resource consumption, and technologies, and the state of the global environment. These links are explored across the content areas of natural resources, land use, the atmosphere, waste and chemicals, ecosystems, and biodiversity. The Atlas draws on research and data from a number of academic institutions and international organizations, including the United Nations, its specialist organizations and agencies; the World Resources Institute; the Center for International Earth Sciences Information Network; Oak Ridge National Laboratory; U.S. Geological Survey; and the UNEP-World Conservation Monitoring Centre. The Atlas was produced to provide a concise, science-based compendium of information on the population and environment topics so important to the realization of a sustainable future.

This tutorial explains some of the techniques developed by astronomers to determine the distances of objects we see in the sky. Links to additional information are embedded in the text.

This page's description of the various kinds of radioactivity includes some discussion of the history of its discovery, illustrations, and hot links to related sites.

This special feature page from the American Chemical Society (ACS) showcases the up-and-coming field of "green chemistry," that is, the development of chemical products and processes that eliminate or reduce the use and generation of hazardous substances. A list of principles behind green chemistry, a searchable bibliography of green chemistry references, and green chemistry links (including conferences). This page comes from ACS's Green Chemistry Project, a three-year educational project to develop and disseminate green chemistry educational materials for graduate and undergraduate chemistry students.

The Ryan White CARE Act provides funds for programs to "improve the quality of life of patients living with HIV/AIDS through the provision of high quality professional education and training." The AIDS Education and Training Centers (AETC) are part of such a program, and they "conduct targeted, multi-disciplinary education and training programs for healthcare providers treating persons with HIV/AIDS." Visitors interested in a thorough overview of this website can take the "Online Tour of the NRC", available on the homepage, on the right side menu. Both the "Clinician Resources" and "Trainer Resources" have "Featured Resources", such as a PDF of a short influenza management guide for HIV+ patients, a PowerPoint presentation on Diabetes Mellitus and HIV, a newsletter, the HIV Meds Quarterly, and a video, "HIV and the Older Adult". Visitors can also view materials on the website by topic, under the "Topics" tab. Topics include "Prevention", "Testing" and "Population/Settings".

AIRNow is a cross-agency U.S. government web site that provides information and forecasts of air quality across the country. The organization's home page features news articles, information on the Air Quality Index (AQI), and highlighted forecasts for areas with AQIs of special concern. An interactive map shows weather systems, winds, and areas where air quality is likely to be compromised by ozone, particulates, ultraviolet radiation, or other pollutants, with links to current conditions, forecasts, and webcams for selected cities. There are also links to educational materials on air quality for younger students, interactive features and visual materials for older students, and curriculum materials for teachers. Other resources include information on AQI for health providers, older adults, and TV weathercasters; information on air quality and personal health, smoke from fires, and links to air quality information from other countries.

This site, operated by the American Association for Artificial Intelligence (AAAI), is a great starting point for people who want to learn more about the rapidly growing world of artificial intelligence (AI). AI Topics acts as a central hub for an enormous collection of material that exists on the Web. The links given on the site offer a wide range of information, including basic definitions of AI, discussions about related philosophical issues, journal articles, and current research. The news section is particularly useful, as it is updated frequently with new developments. Most of AI Topics are geared toward high school students, undergraduate students, people with little knowledge of the subject, and people interested in pursuing a career in AI.

The Australian Nuclear Science and Technology Organisation (ANSTO) "is responsible for delivering specialised advice, scientific services and products to government, industry, academia and other research organizations." Researchers can learn about the Organization's ion beam analysis, accelerators, environmental systems, and additional facilities, capabilities, and services. The website offers pdf files of the organization's annual reports, news flashes, and media releases. Individuals can learn about managing radioactive waste, the functioning of the National Medical Cyclotron, and nuclear technology development. Students and teachers can read the editions of the science magazine, _Velocity_, and find tutorials on nuclear technology.

This Astronomy Picture of the Day shows a test in which a small satellite was tethered to the Space Shuttle in 1992. Numerous wide-ranging links provide further information.

This Astronomy Picture of the Day (APOD) image shows a laboratory test of the ion drive engine used to propel the Deep Space 1 exploratory probe across the solar system in 1998. The site includes a description of how the device works and provides links for related information.

This APOD page features the first confirmed image of an extrasolar planet orbiting a sun-like star. Text and numerous links provide additional information; one link goes to the press release of the confirmation.

This Astronomy Picture of the Day depicts the Himalayan mountain range in Nepal. The image was taken from the International Space Station. Links provide background information about Skylab, the Himalayas, and plate tectonics.

This Astronomy Picture of the Day shows the "dust flaps" that Apollo 17 astronauts jury-rigged on the lunar rover. The site describes the origin of lunar dust and provides links for further information.