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People in the United States celebrate their Independence Day with fireworks, usually in community-sponsored displays that fill the night sky. Learn the science behind the rockets' red glare at a Web site authored by Petri Pihko, a chemist at the University of Oulu in Finland. He explains what ingredients are responsible for the color and glitter of pyrotechnic fountains and rockets. His site includes colorful pictures and many links to other pages on the subject.
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