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There are two ways to browse the site: (1) use the search
button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button.
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and (2).
Hold two sheets of notebook paper about four inches apart. Blow between them. Instead of flying apart they come together. The air moving rapidly between the two pieces of paper has less pressure than the air pressing on the outer sides of the paper.
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Updated: November 05, 1999