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Disease The Public Health Agency of Canada has information on everything from chronic diseases to immunization. Be sure to check out the Emergency Preparedness section.     Insects The Center for Disease Control and Prevention covers topics such as parasites, viruses, insects, and bio-terrorism. An additional CDC web site discusses diseases related to insects and their relatives.   Visit Health Canada's web site to read about how the Canadian government is reacting to the threat from the West Nile Virus. Check out the latest animal cases submitted for testing, see maps of documented cases, and learn how to protect yourself from infection.     Extra-Terrestrial Hazards Geomagnetic Data and Geomagnetic Storms - Reducing the Threat to Critical Infrastructure both provide information on geomagnetic storms and their effects on earth's systems, satellites, animals, and power systems.   Solar Alerts and Forecasts. This site provides tables of information on solar activity and conditions with links to real-time observation data.   Radiation's Effects on People. Radiation hazards to NASA astronauts and air crew.   Solar Cycle on the Rise. A chart that shows sunspot activity since 1915.   Sunspot Index Graphics. World data centre for sunspot data since 1700.     Space Rocks The danger from meteorites and asteroids is real, although several movies have probably over-dramatized their impacts on Earth. Large space rocks have been known to hit Earth causing craters, such as Meteor Crater in Arizona, which is 1.2 km across and 170 m deep. Firestorms, such as one recorded in Tunguska, Siberia in 1908, are a result of meteorites. Even climatic change and mass extinction - possibly what happened 65 million years ago when a massive meteorite is thought to have impacted the Yucatan region of Mexico sending a dust cloud around the world - are also the results of meteorite damage. Several excellent sources of information are listed below:   Canadian Space Agency. Learn about Canada's contribution to space technology and our astronauts.   Keeping an Eye on Space Rocks. An animated web site from the Jet Propulsion Laboratory at the California Institute of Technology that describes meteorites, asteroids, and comets.   Asteroid Watch. This site features a collaboration "with other schools around the world in determining the factors affecting the appearance of impact craters and their ejecta."   The Disaster Center. Another source of hazards information, with links to meteoroids and comets.   Meteors, Meteorites, and Impacts. This site describes the Tunguska event, the demise of the Age of Reptiles (dinosaurs), and other recorded events. |