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2. How to use Excel: A beginner's guide to Microsoft's ... - AOL

   www.aol.com/news/excel-beginners-guide-microsoft...

   You can use Excel, Microsoft's spreadsheet program, to store, organize, and analyze data in a number of ways. How to use Excel: A beginner's guide to Microsoft's spreadsheet program Skip to main ...

3. Wikipedia, the free encyclopedia

   en.wikipedia.org/wiki/Main_Page

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

4. Online tutoring - Wikipedia

   en.wikipedia.org/wiki/Online_tutoring

   Worksheets, online bulletin boards, and threaded discussions are examples of tools for e-tivities. An e-tivity may be an effective learning tool if it has an illustrative title, a stimulus or challenge, involves invitations to learners to post messages, is carefully timed, has postings to which others can add, and summaries, critiques or ...

5. Econometrics - Wikipedia

   en.wikipedia.org/wiki/Econometrics

   Econometrics is an application of statistical methods to economic data in order to give empirical content to economic relationships. [1] More precisely, it is "the quantitative analysis of actual economic phenomena based on the concurrent development of theory and observation, related by appropriate methods of inference."

6. Chemistry - Wikipedia

   en.wikipedia.org/wiki/Chemistry

   Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

7. Playfair cipher - Wikipedia

   en.wikipedia.org/wiki/Playfair_cipher

   A good tutorial on reconstructing the key for a Playfair cipher can be found in chapter 7, "Solution to Polygraphic Substitution Systems," of Field Manual 34-40-2, produced by the United States Army. Another cryptanalysis of a Playfair cipher can be found in Chapter XXI of Helen Fouché Gaines' Cryptanalysis / a study of ciphers and their ...